Here's a sample of my some on my iPod:
93X HAMS Stupid News - morning FM DJ show on stupid news - about 10 minutes - really funny group and short
Delta Park Project - couple in Portland, OR talking about what they want to - 30-50 minutes - it's fun to check in every now and again. Clean language and various topics.
Ebert & Roeper - the audio from their tv show doing movie reviews - just over 18 minutes - it's nice to not have the commercials, but there's no video. I don't go to the movies hardly at all, so it's nice to hear about what's coming to be more selective on what I do go to see.
KCRW's Left, Right & Center - the radio program from NPR - varies from 18-50+ minutes - I hear some interesting positions (sometimes some doozies) on current political events. I don't treat it as fact, just opinion, but there are some interesting points that come up. Just if it came with a BS meter (should be a requirement for all political shows).
Michael Feldman's What'd Ya Know - NPR program - 4-7 minutes - short and witty
NPR: Wait, wait, don't tell me - NPR program - varies - longer, but a fun listen
Slacker Astronomy - two people talking about interesting astronomy information - varies - recently bought a telescope and wanted more info (was one of my first subscriptions).
StarDate - NPR short on astronomy - 2:07 - short and informationtional
The Official LOST Podcast - the podcast from the network - varies - Started watching the show and enjoy the complex layering. This podcast is like a second DVD with commentary and interviews.
ThePodcaseNetwork - Cranky Middle Manager Show - varies - fun sometimes; Dilbertish at times
Diggnation - just started listening yesterday (we'll see)
Various education items (IT lectures from Harvard, Italian grammar, a podcast from my church with lessons/talks/discussions)
One that was discontinued is ABC's LOST: The (enhanced) Transmission - a couple living in Hawaii did an AWSOME job with a rehash, comments, call-ins, predictions, and spoilers. But, they decided it was taking too much time and signed off.
Between podcasts and books on cd, my iPod runs a few hours a day, plus it plays music in the background at work. I have to recharge daily.
Oh, yeah. I get everything through iTunes and the Apple store (all free, though). Haven't looked at individual web sites.