See, people want more!!!
twitter, facebook etc, are definitely great ways to raise awareness. TRONSector has a facebook page, right? Post links to new episodes on their page as well as the TRONCast page.
At the very least, edit episode 3 and put that out.
Like you said, you're pretty much the ONLY TRON podcast out there (believe me, I've checked), so let's keep em coming.