Making a wp theme from a psd is fairly easy, maybe a bit easier than you would expect.
Here are some:
http://themetation.com/2008/07/14/how-to-create-wordpress-themes-from-scratch-part-1/
http://code.tutsplus.com/series/adaptive-blog-theme-from-photoshop-to-wordpress--wp-28964
http://psdtohtmltuts.com/category/html-to-wordpress-tutorials/
This one is premium but the reviews for it is very positive and has a lot to offer:
http://css-tricks.com/lodge/
There are many other awesome ones. I know lynda.com has something available but they are premium as well.
Here is the lynda.com one, like css-tricks, it is worth the money:
http://www.lynda.com/WordPress-3-tutorials/creating-and-editing-custom-themes/67160-2.html
Also, converting a psd to wp is easy... simply look at it this way: psd to html(5) website to wordpress... maybe that would make finding resources/solutions easier :)
If these links didn't help, feel free to Google for some more.
Hope that helped!