Definitely raise your hourly charge to at least double what you are charging now. I do some computer consulting on the side too, the same thing you do, and I charge $50/hour. Professional firms, as Slim pointed out, can charge more. Since I do most of the work for friends of the family, I don't feel comfortable charging them much more than $50/hour. Truth be told, I sometimes feel bad charging them the full $50, but I have come across more clients that think $50/hour is a bargain than the other way around.
Oh, and I wouldn't worry too much about becoming certified (A+, CCNA, etc.) unless you plan on working for or helping an IT firm. For your little business, which I compare to mine, all you have to do is show you are savvy with computers and people will trust you. If you plan on having the majority of your clientele be those "I don't know anything about computers, could you help me?" people, then you don't need any sort of fancy certifications.
No, I like women.