Google announced the project lists for Summer Of Code 2008. Some of the more interesting projects from my perspective:
Adium
Dojo Foundation
FFmpeg
Gallery
Inkscape
Joomla!
The Mozilla Project
- Natural language parsing for automatic calendar event creation
- Powerful search engine for SUMO
- Support OpenID as an account login in Bugzilla
- Google Contacts Extension for Thunderbird
MySQL
- Streaming Enabled MySQL Driver for PHP
- MySQL query analyzing tool
- New in-memory storage engine
- Memcached for Query Cache