If the view from your hotel window is an important part of your travel planning you'll want to check out Rooms With Great Views, a web site devoted to cataloging the impressive views from hotel windows around the world.
At Rooms With Great Views (RWGV), you can browse entries in a sequential blog interface to get an idea of scenic places you may want to travel or search using a Google Maps mashup to cherry pick entries from locales you'll be visiting. You can also browse by country, city, and region to save yourself the swooping around in Google Maps.
RWGV catalogs everything from high-rise hotel views to rural cabins. If you're visiting an unlisted locale or hotel, snap a few pictures to expand the database. Rooms With Great Views is a free service and requires no registration. Have a favorite travel tool for finding great hotels? Let's hear about it in the comments.