The current Stack Exchange network (Stack Overflow, Server Fault, Super User, and Meta) decided to public their database under a Creative Commons license.
All those great Stack Overflow questions, answers, and comments, so generously contributed by all of you, are licensed under cc-wiki (also known as cc-by-sa)
Here is the link to download their Data Dump
[text] http://blog.stackoverflow.com/category/cc-wiki-dump/[/text]
This reflects all public data in:
1. Stack Overflow
2. Server Fault
3. Super User
4. Stack Apps