The search for the right topic

I think I'm going to start another blog that focuses on a specific topic; one that isn't just personal, and keep this one for all the personal stuff. I'm trying to come up with something good, because if I can get visitors to come to my site I can make money with ads. And the more focused it is the more likely companies will WANT to advertise on my blog, and then the more I will get paid. I'm also gonna need more exposure probably. I need a topic first. I'm getting ahead of myself :P
I think I might go internet related. I'd really like to come up with something new, but I tend to be terrible at that. Maybe I could review websites and internet related software. Hmm... Maybe it will come to me as I drift off to sleep tonight, like all my other good ideas.