I've provided the main logo and the two shiny ones in SVG and various PNG sizes. The PNGs are white/transparent which will make it easy to color them yourself (in LÖVE), but this also makes them invisible in a normal browser.
And yes qubodub, there's proper license information . Sorry, no public domain. I like the "don't claim that you made this" clause in ZLIB.
I could make some small banners and stuff too, but I'm not sure about the standard sizes. SourceForge uses 88 x 31, maybe that would be appropriate.
EDIT:
There are no fonts. The glyphs are custom-made. As for the style guide, I'm not sure what you mean.I'd like to know what font is being used for most of this stuff. It'd be nice to have a style guide for stuff. Rude? Mike?