In general, if you want to contribute, write email to
<a href="mailto:contribute@opengroupware.org">contribute@opengroupware.org</a>.
Please give us some time to respond in the setup stage (we are getting loads
of email) !<br />
<i>Update:</i> We are currently collecting mails of people wishing to
contribute, so that we can coordinate the work.
<p>
  Right now the best thing to contribute is to check whether the packages
  we provide actually work and that the webserver has no bugs ! If you find
  problems, please send a description to
  <a href="mailto:feedback@opengroupware.org">feedback@opengroupware.org</a>.
  <br />
  We are going to post some ideas on possible contributions in the next weeks
  (we have loads of them as well ;-).
</p>