I have to admit that I'm fairly retarded when it comes to putting ads on my site and when I tried OpenAds (now OpenX) a few months back, I was thoroughly confused by how it was set up. I got the thing to work, but I really didn't get how it worked if you know what I mean. Google Ad Manager really makes the complicated process of placing and selling ads on your site much easier. Obviously, you don't have to install any software since it is hosted by them, and all that is required is the ability to follow directions and cut and paste (perfect for my bad ass ad skillz).
I haven't gotten into figuring out how to sell ad space yet, but I'm sure there is a tutorial for that as well. I don't even know if there is some kind of marketplace set up for that, although it seems like there is since you can opt to allow advertisers to see your placements. That is the next thing I want to look into!
So is it worth it? Yeah, I think it is. I now have one interface to manage Adsense and have the possibility of easily selling that same ad space to other publishers. Once I figure more of this out I'll post my thoughts again, but right now I'd say that this is the perfect tool for people who need a no hassle ad manager.
To sign up for Ad Manager you have to request an invitation.
If you have signed up for Ad Manager, I'd like to know what your thoughts are...