Just a few names to chuck in as suggestions:

Mark Watson
Rhod Gilbert
Harry Hill
Jon Richardson
Demetri Martin
Stewart Lee
Richard Herring
Tim Minchin
Sarah Millican

David Cross, Louis CK, Sarah Silverman, Dylan Moran, Stephen Merchant, Ricky Gervais, Reginald D Hunter and Chris Rock in an ideal world. 

Not sure if i'm asking too much but...

Tim Minchin
Rhod Gilbert (a must for latitude)
Jimmy Carr
Simon Amstell
Jack Dee
Lucy Porter
Tom Stade
Jason Manford
Lee Mack (went to see him this year but he didn't turn up, or maybe he was just really late)
Russell Howard
Stewart Francis
And..... never gonna happen but michael mcintyre

apparently Angelos Epithemiou from Shooting Stars does stand-up!

NO ONE GIVES A BUTTMUNCHKIN, COMEDIANS ARENT FUNNY.

ORIGINAL: SigmundFreudMumLover

NO ONE GIVES A BUTTMUNCHKIN, COMEDIANS ARENT FUNNY.

Mr. Freud and I don't always agree on all matters Latitude, but I think he has half a point here. Obviously, he is wrong in the sense that plenty of people do care about the comedy at Latitude - and I do in the sense that it provides variety, and (depending on the lineup) credibility, for the festival.

However, I do often find that standup routines are patently unfunny. I only watched the odd snatch of a set this year (though I did enjoy Rich Hall and Miles Jupp last year), but I'm told that so many of the comedians based their sets around some moribund tale of discussing erections with their fathers (even the previously funny Dave Gorman - who used to have a very unique style - apparently reverted to this stock type).

Similarly, I've often seen shows that pair comedians and politicians: the politician is almost invariably funnier.

I do feel, however, that last year's comedy headliners were better than this year's (a trend shared by most of the tents at the festival - good though it still was). It's important that Latitude has good performers across all genres.

Thinking Doug Stanhope (of Newswipe fame) would be good. I'm not gonna pretend I'd heard of him before this series - I hadn't. But I and many other am finding him to the be the highlight of the series and his UK festival appearances seem to be pretty legendary.

In August 2009, Doug was the subject of heavy booing and was at the receiving end of several thrown bottles at the Leeds Festival in the UK, he got the treatment after making derogatory comments about the Royal Family and the attitude of the English, which he likened to people in the stone age. Many people left early, though many hecklers stayed for no apparent reason, whom Doug continued to bait and taunt throughout his set. Doug finished his set to a standing ovation from the remaining half-full tent.

As long as its not a load of "Hilarious" atheists making LOLZZZZZ AT CHRISTIANITTYYZZZ jokes, its cool.

Over the last two latitudes I have only seen one comedy act, the tent is all ways full to overflowing. festival republic have a big problem with the comedy tent it only holds about 2000 people, and melvin said the comedians or there agentes would not play in bigger arenas.therefor if you booked a top comediam like ALAN CARR you would get four thousand people going to a tent that only holds 2000  and lots of unhappy people. this one is hard to resolve

I came to sugest Demetri Martin, but seems you already put him in your first post. So yeah I second that.

Video evidence of why he should be at latitude: http://www.youtube.com/wa.h?v=9IbhWG2LLAA&NR=1

Doug Stanhope would be brilliant. I saw him in September, and he was fantastic. My favourite comedian since the great Bill Hicks. Jon Richardson and Chris Addison would also be great. Please no Michael McIntyre.