Since originally posting, I've largely switched to SoundCloud, which is widely used by musicians in particular, but so long as you can upload and generate an embed code to post within your blog you could use any site from dozens that offer this facility.
Don't use YouTube for podcasts.
|A GCSE student making use of SoundCloud|
RESIZING THE SOUNDLOUD EMBEDDED PLAYER
The default player is rather large!
Below I'll show you how to alter the size, so you can (if you wish) get something like this:
Thats a bit extreme: WIDTH 20% HEIGHT 100