These are a few I listen to. I like them. There fairly informative and only range from 10 to 40 minutes.
1. Web 2.0 show
3.Talking with Talis
4. ALA Library 2.0
The Web 2.0 is highly recommended as they've had some great Discussion with some large web 2.0 websites, like 37 signals and people from Google amongst many others. If you wanna hear about the new web 2.0 companies EITHER side of the atlantic, this is it.
Talis is more Library 2.0 specific, and very interesting, but there output is less regular.
Anyhow, happy listening.