You've probably heard of a few podcasts that interest you, but having to watch their feeds, or subscribe through software like iTunes, sounds like a hassle. Zune.net, the web side of Microsoft's media gadget, lets you watch and listen casually, for free.
It doesn't work for every show, but in many cases, looking up a podcast on Zune.net's podcast section gives you instant streaming access to both video and audio shows. Better still, you can create an instant playlist to stream your shows continuously—great for getting through recent stuff while you work or otherwise move on to different browser tabs.
As some commenters have noted, many podcast publishers' web sites, and some feed readers, offer on-demand streaming video and audio, but Zune.net is a solution that you can pop open any time in a browser, whenever you feel like checking in on a few favorite pod programs.