Dot Matrix (Spaceballs)
C3PO (Star Wars)
Battle Droid (Star Wars)
Sentinel (The Matrix)
Tin Woodman (Wizard of Oz)
Dalek (Dr. Who)
Sonny (I, Robot)
Rosey (The Jetsons)
Jenny (Teenage Robot)
GIR (Invader Zim)
R2D2 (Star Wars)
Cat and Mouse (Tom and Jerry)
Some more Wall-E robots
I didn't know all of their names, but I recognized them and looked up their names on Wikipedia.
Rosie from the Jetsons
Robot from TMNT
Tom and Jerry
AstroBoy - junk dog
That robot dog from the animated show featuring the nerdy kid.
ABC Robot (Or is he the terminator ?)
Cleaner robot from wall-E
Twikki from "Buck Rogers" (80's TV show)
V.I.N.CENT from "The Black Hole"
Maximilian from "The Black Hole"
A robot from "Yo Gabba Gabba" (a kids show)
Cylon from "Battlestar Galactica" (1980's).
Cylon from "Battlestar Galactica" (2000's).
Maria from "Metropolis"
The robot from the "Fantastic Four" cartoon (late 70's, early 80's).
7 Ark 7 from "Battle of the Planets"
Robot dog from "Battle of the Planets" (I can't remember its name)
Robot versions of "Bill and Ted" from "Bill and Ted's Excellent Adventure"
Rover from "Planet 51" ?
OK, got a few more that I think have been missed (sorry if I missed someone else giving them):
Kryten from Red Dwarf
A Scutter, also from Red Dwarf
Bubo (the owl) from Clash of the Titans (original version)
The butler robot on the right looks like one out of Sleeper (Woody Allen's character pretends to be one at one point)
Evil Edna (television set from Willo the Wisp - British kids programme)
Marvin (someone's already got him, but there are two: TV and film versions)
Ludwig (bizarre cartoon - that's the egg with the violin)
Nono from Ulysses 31
Another Wallace & Gromit character - the cooker is from A Grand Day Out
Smash robot (instant potato advert)
And I'm going to completely kill any credibility I've got by recognising Noo-Noo from Tellytubbies.
OK, here are a few that I knew and that haven't been identified yet:
Thundercleese, The Brak Show
Robby, Forbidden Planet
Horny Robot, Robot Chicken
Diagnostic Repair Drone, Farscape
Enforcement Droid Series 209, Robocop
Sleeper Domestic Robot, Sleeper
Bubo the Owl Robot, Clash of the Titans
Nomad, Star Trek
Johnny 5, Short Circuit
Larry 3000, Time Squad
The Robot, Lost in Space (TV series)
The Robot, Lost in Space (movie abomination)
Robert, Fireball XL5
H.E.L.P.eR., The Venture Brothers
Muffit, Battlestar Galactica
Haro, Gundam sagas
Bad Robot, logo for JJ Abrams Bad Robot Productions
[Edit: Matthew posted a few of these while I was composing]
marvin the paranoid android,
the robots from laputa, castle in the sky (very top left)
evil edna, not a ROBOT BUT A witch telly
the little blue one bottom left, from little robots kids telly cartoon
robots from the woody allen film the sleeper
rodney copperbottom from robots
the hoover from teleitubbies