There is currently one mailing list for Windstille available:

• Windstille-Devel mailinglist - discussion of the game development
• Windstille-Commit mailinglist - automatic messages of code pieces commited to the source code repository

In addition to that you can reach me via ICQ (UIN: 59461927) or Jabber (ID: grumbel@jabber.org). You can also find me on IRC: irc.freenode.net, Channel #windstille, Nick: grumbel.