color scans from the pilot episode - 1972:

Mollie Sugden and John Inman pose for the closing credits
Mr. Mash dropping off his delivery to Mr. Humphries
the very young Mr. Lucas gets a grip
Misters Humphries and Grainger discuss Mr. Lucas' obliging nature
Captain Peacock shows the new junior Mr. Lucas the PROPER way to fold a hankerchief
larger pic of John Inman posing for the closing credits
Mr. Mash shows Mrs. Slocombe what she'll have to display at her counter

scans from "The Clock" - 1974:

the dance scene
Mr. Grainger learns from "Young" Mr. Grace that Grace Brothers isn't retiring him just yet
Mr. Grainger holding his shoehorn/backscratcher, with Mr. Rumbold
Larry Martyn posing with the Pussy Boots display used in this episode

scans from "Wedding Bells" - 1975:

the cast fooling around with novelty knickers used in this episode
similar to the one above
Rumbold, Grainger, Humphries, and Lucas confer - note the microphone!
Mrs. Slocombe praises the institution of marriage to Young Mr. Grace
Mrs. Slocombe tries on a wedding dress

scans from "Christmas Crackers" - 1975:

Captain Peacock wearing his novelty
Goddard, Mr. Grace, and Mr. Grainger

scans from "The Father Christmas Affair" - 1976:

Misters Humphries and Lucas attempt to teach Mr. Grainger a dance to the tune of "Mammy"
a large shot of Mr. Lucas during the "Mammy" routine
frankly, I haven't seen any guy except RuPaul that looks good in drag

scans from "Mrs. Slocombe Expects" - 1977:

Peacock, Humphries, and Lucas eavesdrop on the latest escapades of Mrs. Slocombe's pussy
Misters Lucas and Humphries
Mr. Humphries in biker gear, in an attempt to look like an average man on the street

scans from "It Pays to Advertise" - 1977:

Rumbold, Slocombe, and Peacock get made up as Inman and Lucas watch
teensy pic of Mr. Rumbold from the above scan
outtake with John Inman, Mollie Sugden, Raymond Bowers, and Trevor Bannister

scans from the movie - 1977:

the cast
close-up of John Inman
close-up of Mollie Sugden
close-up of Trevor Bannister
close-up of Arthur Brough
close-up of Wendy Richard
close-up of Nicolas Smith
close-up of Harold Bennett
close-up of Frank Thornton
close-up of Arthur English
another close-up of Arthur English
Jennifer Grenville and Arthur English
Wendy Richard takes a ciggie break
Wendy Richard, still on her ciggie break
small pic of Wendy's face
another small pic of Wendy's face
small pic of Frank's profile
small pic of John Inman
small pic of Arthur Brough
small pic of Penny Irving with Harold Bennett
small pic of Trevor Bannister looking weird
small pic of Nicolas Smith
small pic of Mrs. Slocombe doing her big-eyed look
small pic of Arthur English in that holiday hat
Trevor Bannister and Wendy Richard
Karan David and Trevor Bannister
"these ARE balloons, right Mr. Humphries?"
color close-up of Wendy Richard
gay guys always get the women ^_^
Mrs. Slocombe staring
Mr. Humphries busted by Captain Peacock (part one)
Mr. Humphries busted by Captain Peacock (part two)
Captain Peacock asks Mr. Humphries to check the chattering y-fronts
Mr. Humphries faints at Captain Peacock's suggestive hand motions
Mr. Grainger at the hotel's formal dinner
Humphries and Peacock have a late night chat (part one)
Humphries and Peacock have a late night chat (part two)
Mr. Humphries gets into a disguise to save himself from Cesar the revolutionary
Mr. Humphries disguised as a nun, again to save himself from the randy Cesar
Mr. Humphries and his trusty blow dryer (with three speeds?)

scans from "Do You Take This Man?" - 1978:

Mr. Tebbs dressed as "Archbishop Halitosis"

scans from "Happy Returns" - 1978:

I could comment on what Little Boy Blue Lucas is doing in this picture, but I won't
Mr. Lucas in top hat and tails, dancing to "Steppin' Out" for the closing scene
Mr. Rumbold gets into a rather appropriate costume as Mr. Harman watches
John Inman, Penny Irving, and Harold Bennett pose after the final scene

scans from "The Junior" - 1979:

Alfie Bass poses
Mr. Humphries in senior salesman gear
Mrs. Slocombe and Captain Peacock

scans from "Strong Stuff This Insurance" - 1979:

the staff take lunch in the canteen

scans from "Anything You Can Do" - 1979:

an adorable pic of Chef Bannister pausing from his shishing to pose for the camera
Mr. Lucas and Mrs. Slocombe listen to Miss Brahms' halitosis-inducing recipe
close-up of Miss Brahms from the above pic
Miss Brahms and Nippy Slocombe discuss their earnings for the day
Miss Brahms alone, from the above scan

scans from "The Punch and Judy Affair" - 1979:

Mr. Humphries *attempts* to make a mannequin look decent

scans from "The Erotic Dreams of Mrs. Slocombe" - 1981:

Wendy Richard posing prettily between takes

scans from "Roots?" - 1981:

Frank Thornton in Scottish gear, with a lace cravat/ascot

scans from "The Sweet Smell of Success" - 1983:

Mrs. Slocombe in the canteen, listening to Mr. Humphries

scans from episodes I could not identify, please help if possible:

James Hayter posing as Mr. Tebbs
a picture of Alfie Bass' face
Frank Thornton shows off his carnation
Captain Peacock and Mr. Spooner
Captain Peacock's forbidding stare

scans of the covers of the AYBS? books:

Are You Being Served? - The Inside Story
Are You Being Served? - The Inside Story (from the back cover)
The Are You Being Served? Stories (original cover)
The Are You Being Served? Stories (re-release by KQED)

scans contributed by others and edited by myself
(feel free to contribute by sending them through e-mail):

Chef Sugden poses for British Television Magazine (by "Rachael Yiddell")
Mollie Sugden with her dog for British Television Magazine (by "Rachael Yiddell")
John Inman in full drag (by "Mr. Coward")
Wendy Richard and John Inman pose for Woman's Own (by "Mr. Coward")
John Inman in an article by The Express (by "Mr. Coward")
John and Mollie in a scene from "Goodbye Mrs. Slocombe" (1984) (by "Mr. Coward")