Re: Looking for D&D 4th Edition DM
Penny arcade did a podcast of a few 4e campaigns to celebrate the new edition. These can probably help you get accustomed to it. I'm pretty indifferent about the system. I looked over the free material when it was first released and didn't end up playing. The only experience that I have with it is listening to a few of them.
Unfortunately I can't find the proper pages for the downloads as they are spread out sporadically through news posts, wizards of the cost message board entries, and itunes pages.
Here's episode 2
http://www.wizards.com/DnD/Article.aspx ... e/20080606