The address is always Evergreen Terrace, though the street number has been different a few times. 742 Evergreen Terrace has been used most often and most recently.
"Incense and Peppermints" by Strawberry Alarm Clock from 1967.
For fourteen years he was known only as the Comic Book Guy. In "Homer And Ned's Hail Mary Pass," aired right after the 2005 Super Bowl, we discover that his real name is Jeff Albertson. According to Al Jean in a quote at TVGuide.com, "We just thought it would be funny to throw it away and give him a normal name after all these years," he says. "There's nobody he's named after. It just sounded like a good name for the guy. We purposely made it as nondescript as possible."
This is a debate that rages on and on. You can read the discussion currently going on at the posting board. I believe, as most fans do, that Matt Groening is toying with us by leaving lots of clues that add up to nothing.
If you use the pause function on a very good VCR, you will see that Maggie costs $847.63, a figure once given as the amount of money required to raise a baby for one month in the United States.
Homer is 36, Marge 34, Bart 10, Lisa 8, and Maggie 1.