http://fivesimplesteps.com/books/practical-guide-designing-f...

It's more about the theory of design, but presented in an accessible style and 'web' context.

There's also the Pragmatic Programmer's 'Design for Developers' book, but I haven't gotten around to anything more than skimming that one yet.

http://www.pragprog.com/titles/bhgwad/web-design-for-develop...

Hope these help.