Most of the slippy-maps I've seen so far have "OpenStreetMap" or similar as the document title. While nicely minimalist, it doesn't always describe what you're looking at on screen. Imagine if it said "OpenStreetMap Oxfordshire, United Kingdom" instead... http://dev.openstreetmap.org/~ojw/TitlebarDemo/?zoom=11&lat=51.76&lon=-1.282