I used measureup, but I thought their questions could have been a little more challenging, and could have had a bigger base of questions. They only had 150 questions in their pool, and their default test settings had 75 questions per test.
Thanks to the outstanding Web Site you are now reading this on, there is no way you should go into the test room without, at least, being 100% sure of the ports and OSI layers!
Self Test software. I used this and it's very good. it even allows you to provide feedback on each question via e-mail. I'm using Self Test's other exams for other certs.
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Here is another site I go to that can give one a vague idea how he or she is doing http://www.mcmcse.com/forums/exams/
www.selftestsoftware.com