There is no central list of this kind. There are distributed proofing projects, currently at
|PG's Distributed Proofreaders:||<http://www.pgdp.net/>|
where you can proof parts of a book. This is advisable when you're just starting out because it gives you some feel for what the work is like.
You can also look up existing, posted texts from the archives and proof them. Just as there always seems to be one more bug in any given program, there always seems to be one more typo in any given text! Download a few, and scan quickly for problems by doing a spellcheck or other automated check; if you can find any problems quickly, then there are likely others to be discovered by a careful proofing.