Adwords works very well for the few weeks you will get away with it.:happydanc
Oveture is good but they pre-screen the adds so you can’t get away with much.
Google has a few issues. One being the fact that they will shut you down if violate the gambling term too many times and leave up adds form others because of the revenue they bring in. If you’re willing to fork out $10,000 a month on advertising than Google will most lickley leave you running for awhile. But if you’re just hitting up 75 cent adds all month you’ll last a week or 2.
If you look at Google for some big keywords like Party Poker. you’ll see the same adds for the same websites up there for months at a tim even using words that Google forbids like “poker”
I suggjest not counting on Google for advertising unless you’re sure your site will pass their guidelines. You can always ask them first.