I must say that I’m amazed at the low number of people listening to podcasts. Surely you commute more than 20 minutes per day (four hours in my case) – why not use it as productively as possible? I keep up religiously with the following four podcasts.

TWiT
TWiT is a weekly round-up of tech news. The quality of the show is usually very high although it varies with whoever is on – look for shows with Jason Calacanis and/or Wil Harris. (Website, podcast RSS)

Buzz Out Loud
Another tech news round-up but on a daily basis. Insightful and funny, so be careful about listening in public – people who sit by themselves and laugh are given funny looks by fellow commuters. (Website, podcast RSS)

Windows Weekly
A podcast about Windows,  Mac and general Microsoft news with Paul Thurrott. (Website, podcast RSS)

Security Now!
Security news, in-depth descriptions of security exploits, user questions and descriptions of how various aspects of the internet works. Very highly recommended when you are able to focus 100% as it sometimes gets very high-tech. (Website, podcast RSS)

Bonus: Audiobooks
My girlfriend just attended a lecture where the lecturer explained how we started off with only the spoken word, then transitioned to the written word with Gutenberg and now we are returning to audible communication again. So if you want to be trendy, you should try audio books! I’m currently “reading” Confessions of an Economic Hitman – you can get it for free if you create an Audible account via this link (only works in some countries). Highly recommended.

All of the above are free, so give it a try. Be careful though – it’s addictive! I tend to walk everywhere I go now, as this gives me more time to listen to my podcasts… (yes, really)

Feel free to suggest other great podcasts in the comments!