My favourite podcast is Manager Tools, that offers an incredible amount of tips and useful background information on many aspects of management. A friend told me about it some 2 years ago and since then I’m hooked. The really cool thing is that all shows have actionable content. They typically last about 30-40 minutes, so I mostly listen to them when I commute to the office.
If you decide to sign in, which is completely free, you get a few additional shows. Believe me, they are worth it! For those that prefer to have some notes to go through and read, there is a professional membership available on a subscription basis. Also, there is a quite active community, so make sure to check out the forums as well.