I can only think of one, off the top of my head.

Edward Stratton III & Kate Summers from Silver Spoons

I think Good Morning Miami too.

Dave and Lisa on "NewsRadio". They got together in the second episode. The producers of the show didn't want to do a Sam/Diane type relationship, since it had been done a lot in other sitcoms.

I forget their names on the show, but on "Hearts Afire" the John Ritter and Markie Post characters met in the first episode, and by the end of the first season were married.

I think Good Morning Miami too.

Yes, I was actually going to mention this show. But forgot the girl's name. lol And it was bugging me a lot last night. I'm looking it up now... Dylan! *finally* lol (And I remember in HS a friend in my chorus class kept saying I reminded her of Dylan, funny)

Anyway...

Yes, and sadly that show went down hill. :( Very fast. I think b/c of the extremely fast Triangle thing.

Piper Halliwell and Leo: Charmed I believe is another example.

I knew Dave and Lisa got Together but I did not know that it was in the first episode of newsradio

Samantha & Darrin met and married the first episode of Bewitched, Sam told Darrin she was a witch on the first show.

How about Sam & Diane on Cheers