Don’t Make Me Think: A Common Sense Approach to Web Usability
Perfect for anyone concerned with how a website works, from novice to pro.

Search Engine Optimization: An Hour a Day
The title of this should help make it clear: You don’t have to spend a lot of time on SEO, but be persistent.

WordPress (Visual QuickStart Guide)
Lots of easy-to-follow pictures in this– check to make sure you get the latest version, however, as the edition is always being updated (just like WordPress itself).

The Company Image: Building Your Identity and Influence in the Marketplace
Joe and Elinor Selame literally wrote the book on branding– this out-of-print book, hard to find as it is, is an essential read for anyone who wants to know about brand identity.