First off, I own howtomakemoneywithads.com and wwwnintendocom.com, two totally different ways of actually gaining hits.
How to make money with ads -- is a nice phrase. In fact, I got this because typically non-computer folks would type something similar in their address bar and throw a dot-com at the end and hope it takes them somewhere. It sure does, it takes you to my parked domain. So far in the past few days it's gained a few hits, somewhere around 20, but nothing to brag about.
The next one, wwwnintendocom.com looks very similar. With people all excited about the Nintendo Wii, and knowing how children (even though some may know more than us) use a computer, many type poorly, just like their 40+ parents. Oddly enough, more people want a Nintendo than to make money with ads, as the hit count is almost 450 as I write this, and it's only been a little over a day.
So what is Google AdSense for Domains? It's a great way to make some money if you had a high traffic domain that still has back-links and gets high traffic. For people like me that just randomly bought some domains, it has it's merits, but don't expect yourself to show up in Google searches.
There are some loopholes however. If you find that your site makes more money with people clicking ads on your parked domain, you can obviously sign up for AdWords and get that domain promoted. It sort of defeats the purpose if you are spending more on AdWords, but it's a thought if you want to land hits to something that has a high CTR and PPC rate.
I noticed that typo-based domains really do get a lot of traffic from the main site they were intended for, but because Alexa only goes to the top 500, you are limited, and most of them are already parked. This doesn't mean if you have a typo in mind you can't just search Alexa for one, but it's a long drawn out process, and to be honest, most are already squatted.
As Google AdSense for Domains is relatively "new", it's hard to say what this will actually generate for me over time. I have some other domains, and all but one were approved. I scored with two domains, sendmoneytopeople.com and nintendoentertainment.com, both of which I am thinking of hanging on to, especially nintendoentertainment.com, I wanted something like that since I was a boy! Sorry, self-indulging moment there.
I haven't made much yet, but as with most Google-based products things may change. I recommend hanging on for the year with a small amount of good, solid names to see what kind of traffic results and pay-outs come. With the economy so bad, we may have to wait till March of 2009 to see any really good payments.

