The source code for all packages in the Ubuntu repository is available at http://archive.ubuntu.com/ubuntu/pool/
Create a Google Code Sitemap so that Google Code Search can index all the source code and make it searchable.
This would allow you to conveniently search through the source code using Google Code Search.
Imagine a search query like, "site:archive.ubuntu.com package:gimp radial blur"
Pretty neat, eh? Would be good for our developers.