I only have one other friend with a BB. We often talk about and try new programs together for the fun of it. My friend won't try this program because he is convinced that he will get a huge cell bill at the end of the month because podtrapper will eat up his download limit. Mabe you could make it more ovious on your website that this is not the case.
I'm not the author of the program, but, by default the program will not download podcasts over the cell network, you must explicitly turn that ability on. By default, PodTrapper will only download podcasts over WiFi.