is it possible to do a div overlay layout in a myspace blog?
is there already a thread or something devoted to how to do it?

You can easily customize your MySpace blog with a DIV overlay layout. It's basically the same as how you'd do it on your main profile. It's just that it has different classes for the blog, the sidebar, etc. There hasn't really been a thread on it, I don't think. It's pretty easy, though.

Yeah, it's pretty easy. I'm sure if you Google MySpace Blog Class Names, then you'll probably get something. Or use on of the Createblog Blog Layout Submissions to get the hide codes.

Or, you can just view the source and check it out yourself. Not only will you learn, but you'd have experience of customizing blogs under your belt.