I just signed up for this program this week, and I'm not sure what to think of it. After I managed to get it to play well with my 'Nuked website (not causing a "Forbidden HTML" error), it seemed to be fairly accurate. It displayed ads relating to video and roleplaying games, which was perfect, considering that I run a hobby site about such games. But after a couple of days, the ads changed to almost entirely webhosting and php-nuke stuff, which doesn't interest my viewers at all.

Has anyone else had this happen? I suppose the only fix here is to increase the number of articles relating to roleplaying and video games, which is not really a problem, but I still don't understand why the change occurred in the first place. My content hasn't changed radically to account for the alteration of displayed ads.

Anyway, I'm up to a whole $.10 in earnings so far, so I'm quietly optimistic about the program. In a couple of months, maybe I'll have earned enough to buy a piece of bubblegum?

I can only dare to dream!

I use it.  The ad content is determeined by what keywords it picks off your page.  I had emailed them to ask about that too since my don't really fit my users either way.  No idea why yours would change.  I mainly put the ad on my site so the google bots would crawl me.  And I have made almsot $2 to boot.  

Jwink is right.  We are not allowed to say our earning for Adsense.  There are several points they note that many people miss.  First of all, their bots will crawl your pages daily now (these bots do not affect your Google rankings however as the bots aren't the regular Google spider).  Next, you cannot in any way bring attention to the fact that you have the ads on your pages such as putting "proud sponsor of" above the links or "please visit our sponsor", anything like that.  Even highlighting them in some way could be seen as a violation of those terms.  Finally, you aren't allowed to place them on a search results page.  So, if you  have a dynamic site that has search results, be careful.  Try to figure out how those pages won't display the ads if you have it set up in a frame on all your pages.  Since the bots spider the content, you can safely assume live people troll the spidered pages to check you site from time to time.  They will warn you first, but your site can be pulled for violating their terms.

Hey, I don't want to be a heavy, but I wanted everyone to know this information.

Have a Blessed Day

The Adsense TOS and other links they provide that you have to follow are full of loopholes and ambiguous statements.

First, you are prohibited from criticising their AdSense "service" terms and conditions.  Uh oh, just violated that one.  Guess that whole right to free speech thing doesn't count once you sign up with Adsense.  Could you imagine if LunarPages had in their TOS that you couldn't go anywhere on the web and say anything bad about them?  Good luck on that.

Second, they say:
Make pages for users, not for search engines. Don't deceive your users, or present different content to search engines than you display to users.
Avoid tricks intended to improve search engine rankings. A good rule of thumb is whether you'd feel comfortable explaining what you've done to a website that competes with you. Another useful test is to ask, "Does this help my users? Would I do this if search engines didn't exist?"
Everyone is in violation of this one in my opinion.  Miraenda, Jwink and I all have have meta descriptions and meta keywords.  Would we do this if search engines did not exist?  No!!!
And you are not allowed to display stats from the program.  Of course not on the actual site you run Adsense, but elsewhere...  And what is a stat?  Is almost $2 a stat?  Is saying I made between $0-$10000 a stat?  What if I said I made almost $2 and I lied?
The list goes on and on.  I won't even go into how they dictate how you can design your page (Make a site with a clear hierarchy and text links - what if I don't want text links?).  Or the fact they say check back periodically, well what is periodically to them?
Finally as Miraenda pointed out the bots that police your site are not the ones that help your search engine rankings.  This is true, but...  When you submit a site to Google, how long does it take to get entered?  Forever.  Sign up for Adsense and they review it right away.  If your site is not in a search engine, how then will Google make money off you?  They won't.  So they put you in their list for the spider to crawl you.  
OK, that's my rant.