I highly recommend just about anything I've written, really.
But sorry, I never market them here and always write them using a "pen name" so they aren't easily traced (if even traceable at all) back to me.
However, I did just finish reading this:
Brand Hijack: Marketing without Marketing
and it has some good nuggets that will get some fresh ideas churning, since it demonstrates how to let your customer base grab your brand and run wild with it.
Though the concepts are largely presented in the context of large corporations, any one with more than 3 brain cells should be able to apply the core fundamentals to branding their website, their service, their product, and even affiliate products.
Edit: Just noticed this fucking thing is $5.75 hardcover from Amazon. I paid ~$20 softcover from B&N like 2 months ago. Ah well, fuck it.