A few blogs run regular podcasts and this offers another medium for monetization. This would usually be in the form of sponsored mentions, where you will mention someone's product/service/website/etc. in return for payment.

Some blogs offer different packages that include full reviews of products on the podcast or advertisements that run within interludes.

Advantages: If you're already running a regular podcast, this method should really be a no-brainer. You can quickly and easily mention the sponsor at the start of the podcast, at the end, or in any gap that you want to fill. If you find relevant sponsors then it could even add to the content of the podcast.

Disadvantages: Getting sponsors this way isn't always easy and you often won't get a huge return from it unless you have a really focused following of listeners. This works great within the music niche but it can be a lot harder to get sponsors in other many other niches.

Another obvious disadvantage is that it could sound a little cheesy having to mention a sponsor mid-flow.