Blog Topics that MAY earn you some MONEY

I say MAY because if you can't write worth a damn (i.e., your content sucks) chances are nobody's going to go to your site anyway.

Following are some popular blog topics which you may want to try out:

Technology (computers, cellphones, and other gadgets)
Work (news, tips, and finding work)
Photography (tutorials)

What blog topic works for you and earns you a pretty penny at the same time?