Forum OpenACS Q&A: Re: Google Summer of Code
Malte, Google doesn't seem to give specific instructions on how to get signed up as a mentoring organization, but you're on the OpenACS Core Team, so I recommend you just contact Google ASAP and ask them what to do. (Who to give the $500 to at the end of the summer is trivial, not need to worry about that now. If necessary OpenACS can just turn down the money and tell Google to keep it.)
Btw, Marc G. Fournier posted about this on the PostgreSQL Hackers list, but so far PostgreSQL isn't listed as a mentoring organization either. Nor is AOLserver or Tcl. Possibly co-ordinate with the PostgreSQL, AOLserver, and Tcl folks to get all the major projects OpenACS uses signed up?