I've just got Channel 4's new on demand service.
For those interested, here are a list of comedies that you can rent.
Sitcoms
*Black Books - Series 1
*Chelmsford 123 - Series 1
*Comic Strip Presents...Sex Actually
*Drop the Dead Donkey - Series 1-4
*Father Ted - Series 1-3
*Garth Marenghi's Dark Place
*Green Wing - Series 1, 2 and Special
*The IT Crowd - Series 1
*Nathan Barley - Series 1
*Peep Show - Series 1-2
*Spaced - Series 1-2
*Ugly Betty - Series 1
Other Comedies
*8 Out of 10 Cats - Series 2-3
*The Adam and Joe Show - Series 1-2
*Ali G Innit - Series 1
*The Convention Crasher
*The Daily Show
*The Friday Night Project - Series 4
*Meet Ricky Gervais - Series 1
*Paul Merton The Series
*Paul Zenon's Tricky Christmas
*Smack the Pony - Series 1
*This is David Lander
*Trigger Happy TV - Series 2 and Christmas
*Whose Line Is It Anyway? - Series 3-4
*The World of Lee Evans - Series 1
So for those of you interested, you can watch these episodes for a small fee. Maybe if you're from outside Britain and there's some shows you haven't seen. I don't think that Green Wing series 2 hasn't been shown in America yet has it.