Official logo? (urgent)

[Michael P. Gerlek]

I need the "official" logo for ordering shirts, right quick.    Larger
size better than smaller.  Vector format preferred, but I'll take what I
can get.

(If need be, I will extract the logo from Peter's Where ad -- but it is
a little on the small side, and I'd have to crop out the "Open Source
Geospatial Foundation" text, though, as that would be too small to
render in fabric...)

-mpg