You don't have to worry about hosting, your videos can easily be embedded onto your wordpress blog and users can access your videos in different places and can also share them out.
I think you're going to run into a bandwidth issue with video. There are three corners to everything (including podcasts) Time, Money, Quality... Pick two! The remaining one with have to suffer.My first thought would be to see if you could just create a voice-cast... That would reduce the file size quite a bit.
You'll need to make sure the host can handle the bandwidth. I've found the easiest way to publish podcasts is to use Feeder.It's very useful! It's trivial to put podcasts into the iTunes store.
I don't know anything about Zune. I've included the Apple link for their suggestions on creating a podcastAdding it to your blog is simply adding a link to the RSS feed (created by Feeder). Hosting?
I highly recommend LibSyn. I've been VERY pleased... especially with MY budgetThere's a bit of information to get you going... Good luck!
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