Boutique Hotel Guides
Adam has provided a link to greatsmallhotels, which seems to be a very good resource along with Tablet Hotels. Both resources focus on boutique hotels around the globe. The price range in greatsmallhotels is broader and has some wonderful looking options at the lower end of the scale. Tablet Hotels has slightly better reviews, the interface is more appealing to me, and I really like the "Sensory Guide" to guide you to things around the hotel's location that match: look, listen, taste, touch, and scent.