Although I'm a newbie to the GMAT club, I'm already loving the forums and advice. (I am a little confused about some areas though.

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First off, I'm an undergrad student planning to take the GMAT in 3-4 months. I'm applying to graduate schools as soon as I receive my score. I'm aiming for a 750. I have been studying out of the Kaplan 05 (w/CD). I'm planning to vastly extend my study materials with the books/tests recommended here.
The things I'm confused about (I've tried to read through as many posts as possible to figure them out, but my brain is going into 'forum freeze'):
The
error log for members w/100 posts: Is that an application that runs in conjunction with test taking on the web site, or is it similar to the Excel log that I've already d-loaded from the mistakes workshop?
Posting is encouraged in response to the math, etc....Is this actual problem solving...to the the tests that are bought from here, or just in general?
Overall, this is a great site, and I'm looking forward to using it in prepping!