Have pre-defined technology tags

Maybe at some point having "free text" for the technologies will prevent some features from being implemented (matching, searching, etc.)

I propose that the site has clear, unambiguous, pre-defined "tags" (ala StackOverflow) to choose from.

Users should be able to suggest or create new tags. But right now it really does not help to have "Rails", "RoR", "RubyOnRails", etc.