I appreciate you having put time into putting this website together. I am in the market for a replacement car for the first time in... 13 years (I'm not a car guy) and I hope I can glean some insight from you.
However, with respect, I have to suggest (you did ask for suggestions.) that you work on cleaning up the copy on the site. I was reading the post on negotiating http://www.usedcartips.org/negotiate.html and it was riddled with typos. It might not change the value to the information offered too much, but it is distracting.
if you are going to put effort into writing it all, why not try to make it read cleanly?
If you would like, I would be happy to submit a revised version with my suggested changes.