ThemeForest is cheap and cheerful - http://themeforest.net/
And of course, now there's Twitter Bootstrap - http://twitter.github.com/bootstrap/
Check out David Kadavy's Design for Hackers book too, for more general design learning.
Wacom tablets are generally for illustrators, not web designers. Freehand drawings do not map well to the rectangular web.
What software do you use to lay things out correctly?
As a programmer, how do I best prepare a html page for a designer? Is putting everything in a div with a unique id enough?
Layout: Content is divided into columns. Twelve colums, six colums, and three columns are the usual suspects.
Preparing HTML for a designer: Use semantic HTML. For anything that's even vaguely list-related, use <ul>. Do not put links in a div by themselves, but sort them into a structured list. Do not use <br> for paragraphs.