I think the searching and categorizing could be public, but perhaps pro users could get eclipse/textmate/whatever plugin + api access to do some automatic stuff. You could have it do a search on the current empty method name and return any similar-sounding snippets in the current language, ready for embedding and sourcing, complete with comments.
You could even have a special kind of in-source comment that links the snippet to the web URL so you can track changes and automatically show the differences and "accept" the changes to your source code. New way to collaborate :)
Those are some very interesting ideas, I especially find the similar snippet lookup thing.
However, for that particular one a more robust database of snippets would probably be necessary, and it would take a long amount of time to gather enough snippets for it to be really useful.
As to some of the other features, I think they go beyond the scope of the project. The premise of codr.cc is to allow you to share code (live or not) using a simpler interface than all the other pastebins out there. That's why I took all of the features that might go a bit beyond that and labeled them pro.
However, I very much like the idea of an API and local plugins. Stuff like a command-line interface etc. would be very interesting :)
It would be fantastic if a site like this also supported categorizing code snippets the way gists on guthub work, and were searchable.