I literally tried about 200 different dot com names for our startup and they were all taken. I had some brilliant ideas. They were all taken. Even the weird ones I came up with were taken.
In the end I settled for something I wasn't 100% happy with. It was a dot com and quite relative to the business, but it wasn't catchy. At the point of registration I knew this would not be the final name. So I decided to stop wasting time fretting about a name and focus on the business and product. I know that at a later stage I will be able to get some clever creative team to come up with a great theme and name and a catchy dot com that encapsulates that theme / brand. So for now our site has a clean design with not too much branding, but will easily be able to apply the changes once the creative team work their magic.