There are many helpful contributors in these forums, but one I personally wanted to extend a "thank you" to is nickjhowe.
Like many users, by the time I got to reading the forums I already knew I wanted a Model S. My research here was really just to make sure I could justify the purchase and to figure out which options I actually wanted. And doing that research was made significantly easier using http://volkerize.com
After finishing my research and ordering my Model S last month, I'm scheduled to take delivery next week and I find myself re-reading nickjhowe's "DELIVERY CHECKLIST AND OWNERS GUIDE" in preparation. Even more impressive is how frequently and persistently he updates it. It's evolved from something that was mostly a pick-up checklist to something that I think anyone starting their research should read first. When you've been around the forums long enough you start to see the same questions pop up over and over again, especially about the options, and the "Before you buy" section pretty much sums up everything I've read with more or less the same conclusions I came to--but more succinctly than I could ever capture them.
Anyway, thank you, nickjhowe. One test drive is all it took to convince the right brain, but for the left brain, your contributions helped seal the deal.