I have a question - something I've always wondered if it's possible, but I've never seen actually executed.
On your standard two column blog (wide-thin), is it possible to structure the css/templates/whatever so that when the display of the right hand column was done, the content from the left would then wrap underneath it? Basically if you have a blog with a long page, the text on the right creates all this dead space underneath it, and I was wondering if there's any way to get around that and use the blank space the right hand column generates once it's done with its content.
Thanks.

Joe - I am almost certain this is possible, but I am not sure it is possible with the default templates as they are structured. What I think you need to do is have you sidebar div located within you main content div. Then float the sidebar div to the right. That should do it.
But because the sidebar div and the main content div are not nested, they will always float side-by-side and completely enclose the content within them, without letting that content fill all the whitespace of the page.