I did the first podcast is 128-kbps and the file was 12.2-MBs, at 96-kbps it is 9.1-MBs, and at 64-kbps it is 6.1-kbps. This is expected. I can also post a MP4 file at roughly 7-MBs.

I think that bandwidth issues will be coming along quickly if something becomes popular.

Is 64-kbps an acceptable level?

SIDENOTE: Adam Curry in his current Daily Source Code 2004-10-12 says his podcast downloads by others of his show is “36-GBs a day” and there is also some interesting info from Geek News Central.