I'm always looking for someone to give me a day off from this accursed job. (Even though the time "off" usually doesn't start until/unless someone has been blogging for me for a while.) Be sure to read the post about guest blogging thoroughly. I don't make enough to pay my guest bloggers more than a few dollars before I see how their article is going to do, but if it does well, I won't keep the fruits of your labor either.
The same mostly goes for blogging for you, although I have a slightly different set of requirements for that since I'm the one doing the writing.
I'd probably love to do your thing, but check in on the requirements.