This site fills a need nicely, it is a very comprehensive list of the tools available to startups.
This is useful because it's when you are getting going that you change all your behaviours and select new best of breed replacements to whatever you were using before. As a result, having a resource that simply lists them all is very helpful.
And for the same reason it's a good place to advertise if you're selling startup tools
There are just too many things to worry about when building a startup. Going crazy? Use the tools and resources here to help you build, run and grow your startup!