I'm still using Voidy, I messed up a couple of times and then upgraded the version, so the header font has gone back to default. Not sure I will bother trying to use Google API on it again, but I might! ;)
Been wondering about the very basic header on Twenty Ten, just in case I find a need to use that theme... I looked into the stylesheet but I can't seem to find where I would make the changes? It would be interesting to see what I could do there!