This is the melting pot of design, there is no right or wrong answer, contribute your logo/marketing material ideas here for discussion!
- Hackspace logo http://www.irvinebrown.com/?p=242
- Royalty free fonts (be sure to select 'Free' in your search) http://www.dafont.com/
Just some different styles, nothing in particular jumps out at me yet as *the* design to have.
Variations on a theme
Gears that could be used
Designed in openSCAD, message me if you want the files to play with.
I've now had some business cards printed up. I've got 200 right now, to tyde us over till we have a proper space to put an address on it.