I was going to say Two and a Half Men, but from reading some of the posts in the SPs think we're losers thread, I think that show qualifies as more of a documentary than a sitcom. LOL
By the way, All in the Family and Three's Company are both based on Britcoms. Till Death Us Do Part and Man About the House respectively. Both of which surpass their American counterparts by a huge margin. I've always found British sitcoms to be hugely superiour to American shows as they don't cater to the lowest common denominator like the US shows, with some exceptions, tend to do.
My fave American sitcoms are in no particular order: Taxi, Barney Miller, SOAP, WKRP in Cincinnati, All in the Family and Night Court. Cheers is just behind followed by Seinfeld and the underrated Wings. Special mention to the original Bob Newhart Show and his followup Newhart, which had the best ending of any television show, comedy or drama, in TV history. Current shows I watch on a regular basis are Two and a Half Men, Big Bang Theory and How I Met Your Mother.
One show that didn't last long but was worth a watch was Stacked, staring Pamela Anderson. Well worth hunting down for a few laughs.
Finally, a show that had a great first season before being castrated by the network it was on: The John Larroquette Show. John Larroquette starred as a night manager of a bus station who was a recovering alcoholic. One of the main supporting characters was a gorgeous hooker. The first season was a great example of dark humour.In the second season they reformed the hooker into a bar manager, moved the series to the day shift and ceased all mention of the manager being a alcoholic. This led to many instances of an elephant walking through scenes as a protest to the changes. It still managed to last into it's fourth season before being cancelled. A real shame that it wasn't allowed to continue in it's original concept.