Questions on Amazon "Associates" Afilliate program and Google Adsense

Two questions:

1) Anyone used the "Amazon Associates" program?? If so did it work well?

2) I've recently become unhappy with google's adsense due to the fact that my clicks have fallen from about $.45 cents a click average to about $.03 a click average, with an occasional "normal" click here and there (been like that for three weeks now)

Anyone know what might have caused that?? I have a few sites, all was going well and then all the sudden the click "price" dropped for no apparent reason.

So I'm going to be trying, unless someone disuades me, amazon and yahoo's programs.

I use Amazon's Associate program and it's great, but it's based on sales not clicks. 10,000 clicks and no sales gets you $0, where at least with Adsense @ $.03 you'd end up with $300.