Preparing for a cert exam and bumped into this awesome site where one can sit for sample exams for various certifications like MCSE, CCNA, Network+ etc etc. Its been a great help to me so I thought I'd share it with people preparing/planning for professional certifications.
site:
The best thing about this site is that you don't need to sign up [as yet] in order to use it. Maybe you guys can share other good site like these [the ones you've used].