From experience..
If you run a community site where profiles and pictures get uploaded
PUT THE PICASA REFERRAL BUTTON....These people barely know how to check
their email so when you offer them something THAT SHOULD'VE COME WITH
THEIR DIGITAL CAMERA (which a lot still don't know how to use)...IT
WORKS...
I was resizing 30-50 pictures a day for people that couldn't upload
these HUG pictures...Now I let them download picasa and do it
themselves...I JUST DIDN'T KNOW that what I offered them would benefit
them until I put 2 and 2 together and resized over 400 pics by hand!!!!
If you have a site where visitors PROBABLY own a website...then use the
AdSense Referral...
If you have a site where a lot of online marketeers go , people with
small businesses online, ebay sellers etc...then use THE ADWORDS
REFERRAL...
Bottom line KNOW YOUR VISITORS...if you know that you KNOW what to
do..If you don't then YOU SHOULD.
-Joey