Blubrry/TechPodcasts are both RawVoice communities with the same statistics system and advertising opportunities. We encourage folks to use Blubrry for statistics and advertising management, but if you don't want to be a member of Blubrry and only TechPodcasts, then the stats are available through TechPodcasts.
The advantage to TechPodcasts (or our other topic specific communities) is that you're 1 show of maybe 50-150, rather than 1 show among 10,000+.