There are two podcasts that do things a bit differently, which I enjoy more:
* https://risky.biz/ has short-ish interviews with the sponsors that focus not only on the product, but often on the market, insights that the advertiser gained from analytics that their products gather etc.
* https://www.acquired.fm/ has 30s spots where they ask their advertiser one question, which gives the advertiser the option to show off some special knowledge in their area, but can also be interesting to the listener. And a different question each episode.
I'd love to get some metrics on how those approaches compare to the traditional 30s to 60s ad reads (in terms of conversion).