Since I primarily use jQuery, I'm now thinking about how to integrate jQuery with it.
The jQuery project has the jQuery UI project, but it is mostly about widgets and stuff like that. I'm more interested in completely general layout styles.
I've spent some time studying some web document and web application structures that I found to be successful:
There are some obvious patterns. Why not try and standardize them to a certain degree? Wouldn't it be nice if you could use the same theme on different apps???