you can search podcasts. in a big way. these guys have like transcripted all the podcasts (i think) and you can type in whatever you're looking for and get a list of podcasts. this is one of those things that's almost so useful it causes a major setback. like i'll start searching for all kinds of shit i want to know about and then realize i don't have time to listen to 37 days' worth of podcasts. but i'm sure it will prove helpful at some point.
on a related note. see karl's t shirts.