And if you want a good name, *.com is already saturated, you have to get really creative and you most likely cannot find domains from single words unless you're lucky.
Speaking for myself, it was painful for me to waist time on finding a good .com when the implementation was far from ready and I didn't have a marketing plan.
"They offered him [previous owner of mint.com] equity in the company's Series A funding round rather than a cash payment, and assured him that he'd be the only New York financier they'd let in."[0]
"I said, “I will give you $181 thousand in Series A equity. If we do well, you’ll get an asymmetric upside. If we go bankrupt, you’ll be in the situation as a preferred investor to get your money out first. I won’t let anyone else from New York into this round of financing"[1]
[0]: http://news.cnet.com/8301-13577_3-10457870-36.html
[1]: http://thinkvitamin.com/asides/aaron-patzer-on-how-to-take-y...