I guess I'll give you both the benefit of the doubt because I've enjoyed reading both of your blogs over the years.
That said, I'm wondering if this may be a move in a direction away from what I found valuable about both of your sites: that they were general enough to apply to many different languages, platforms and technologies. A site for collecting "good programming knowledge" inevitably will get specific and detailed, and since I'm a Python/MySQL/Mac guy, I'm not sure a site managed by Jeff Atwood and Joel Spolsky will be the best resource for my detailed technical questions. How can you compete with comp.lang.python? Or other communities that have the core developers actively participating?
As for a podcast, you need to do a little homework on the status quo. Download a few technical podcasts from iTunes and play around with them. All the good ones have track indexes and notes that give you "random access" to the podcast. And all of them have some sort of subscription capability like RSS. You really should put some effort into doing this part of the site right if you want to keep people interested.
Still, like I said, I'll give you the benefit of the doubt and form my opinion after a couple of months of seeing and listening to what you guys have to say.