I tend to agree with 37Signals on this -- they basically say that the name of your product matters a lot more than that product's domain name, so long as you get a domain that's "close enough." If you think about it, that makes a lot of sense, because most people find sites on the web either by following links or by searching Google/Bing/etc., neither of which rely on knowing what the destination URL is.<p>His advice of buying the actual product name (e.g. foursquare.com instead of playfoursquare.com) post-launch is good advice though, because it can help push your product beyond the early adopter stage.