Lol. I must be tired. I read the title of the topic as 'Sizzling Suggestion'.

Oops.
Anyhows, I would say much the same as others, with a few additions. They are:
-My standard blend size is 500x700.
-My standard linking button is 100x35, although some are 50x50. And there's another size I can't remember off the top of my head. Ah well.
-I think 450x100 is a common banner size, too. I might be terribly wrong though. I'm a bit tired at the moment, and hence prone to being slightly inaccurate.
Have fun graphics making!