You guys could try to do some kind of crossover with Geek & Sundry (Felicia Day). They are usually pretty friendly with others in the industry.
They are doing a tabletop gaming show with Wil Wheaton on Youtube but I don't think they are really in competition with you guys. They play a different game every week whereas you guys have the whole continuation from episode to episode thing, plus you guys focus on the podcast format instead of video.
They just started this whol TableTop gaming day thing, so maybe it's a good time:
