I still love Seinfeld. I watch it all the time and I have all the DVDs that have been released so far. I like the older episodes of the Simpsons too, any of the new stuff just doesn't seem as good as the old stuff to me. I used to love ER too, I've kinda lost interest in it in the last few years though, well really it was when Noah Wyle left. I loved Dr. Carter.
As for current shows I try not to miss:
Two and a Half Men
CSI
CSI: NY
American Idol
... I think that's everything
We don't have Dr 90210 here I don't think, what channel is it on? We have a show that sounds similar that I enjoy.