TV producers, thy name is vanity. Most of them get personalized tags at the end of the credits, but do any of the new season's sign-offs compare to that classic, ''Sit, Ubu, sit. Good dog''?
1. HOW I MET YOUR MOTHER (CBS) Care for some education with your comedy? The postal pooch is actually based on Laika, the first Soviet dog in space. Says producer Craig Thomas: ''Hey, it's a public service.'' A-
2. BONES (Fox) Hart Hanson sticks to his Pacific Northwest roots, honoring poet Theodore Roethke's work: ''It's evocative writing the kind you don't get to do on television.'' B
3. REUNION (Fox) After toiling in sitcoms for years, Jon Harmon Feldman now mocks the genre each week: ''The joke was I'll be stuck forever on the worst but longest running show, 'Oh That Gus!' It seems like the name of a character David Leisure might play.'' B+
4. MY NAME IS EARL (NBC) Each week, a different pal of creator Greg Garcia is in the logo: ''People ask to be the picture and I'm thinking, There are 100 others going in before this yahoo.'' A-