From WxWiki

[edit] Help Wanted

These are projects we are very interested in seeing happen, but can't devote time to right now. If anyone wants to help and has some extra time, these are some great ideas of how to help the wxWidgets project!

Go to the wxWidgets SourceForge page and make patches for some of the bugs or feature requests posted there (that aren't assigned).

Also, see the discussions in the Developers Notebook. This contains a good part of the more involved, sometimes controversial, conversations between developers - lots of stuff there has probably been put off. You could help by bringing discussion and solving some of the issues that are outstanding and even more if you could implement the solutions to those problems.

See also: WxWidgets Bounties New wxWebSite TODOs