As far as I'm concerned, if you want to start a podcast, by all means start a podcast. Just go ahead and start a meta post with your proposed podcast topics and overview and see who else is interested, then go from there.
There was an attempt recently to try to get a UX.SE blog off the ground, but that hasn't yet taken off. I think if it's hard enough to get a blog going then a podcast is likely to be even trickier.
Perhaps a podcast could be wrapped up into the blog idea?
I have 11 listed on my list - added one using “edit” just last night, and it scrolls through them all fine.
So, I did notice I had to repeat the “add” routine twice before it saved it as it should - or I was being stupid and not actually hitting save ... :)