At Bob Wang's suggestion, a new thread to tell everyine about a temp file, cookie, history files etc cleaner for Windows (works as well under XP as Vista, and also earlier Windows versions:
Somewhere I found ATF cleaner. Choose what to clean, and it's done very fast. It's publisher's webpage (atribune.org) appears to be off right now, but Majorgeeks still seems to have the download. Not sophisticated, but free.