Auto-streaming media files in RSS readers

One of the things I like about Google Reader is the fact that if an RSS feed includes an audio clip, it can be played from within the app, using a streamed approach. I think. I'm assuming the Quicktime (Flash?) plugin that's embedded within a page may also be able to also load and play MP4s for video podcasts.

I'm hoping MSIE 7 and other aggregation clients will continnue to support such functionality, especially for vidcasts. I'd like people who don't necessarily subscribe to our stuff to access content, too - whether or not they download an entire show or segment.