Cross promotion with other media works well in normal television situations, has it worked well for hak5? Obviously we don't want it to interfere with hak5, that'll loose us more viewers than the publicity will give us.
Maybe some pre made posters or photoshop sets to make our own posters like the "GET DOWN AGAIN" stuff, but for hak5 for us hacklings to put up around were we live would be worthwhile as well. I know of quite a few places where I live where people would at least take a passing glance.