I think some people (read: "old people") probably don't even know that non-.com tlds exist. If you want to create a memorable domain, you are seriously handicap

I think some people (read: "old people") probably don't even know that non-.com tlds exist. If you want to create a memorable domain, you are seriously handicapping yourself by not going .com. If your success and customer aquisition is going to be more viral in nature, spreading through invitations/Facebook, or if it is dependant on SEO for traffic, then I don't think it matters as much. I'm (someday) going to launch my "November" Startup sprint project and went with a non-.com url (http://www.rankoro.us/ http://www.rankoro.us/) but, just to be safe, I reserved http://www.rankorous.com http://www.rankorous.com as well.