I found a list of the top paying keywords for the Google AdSense program on the DigitalPoint forum. Not sure how old the list is (or how accurate!), but if it is legit, then it would appear the loan business is a license to print money! Six of the ten top paying keywords are related to loans or student loans. Surprisingly conference call services sits at the top of the list.

conference call services $73.42
student consolidation $66.66
federal consolidation loan $60.04
ca lemon law $59.91
indiana law lemon $58.21
home equity loan rates $57.26
equity loan rates $56.98
best consolidation loan student $56.46
life insurance quotes $55.72
student loan consolidation $55.22

Looking at the list it makes you wonder what sort of revenue are these companies generating so that they can afford to pay $50+US each time someone clicks on one of their ads? All I can think of is that ads featuring these loans based keywords must have a massive conversion rate to make it all worth while.

That said, checking accounts and related information also seem to go ok. So my suggestion, if you want to make money from a blog, create a finance type blog, and get cracking!