Looking for road maps

Hi,
Does anyone know if road data is available online anywhere? I'm making topographical maps from the SRTM data (http://srtm.usgs.gov/), and would like to add some roads and place names. These are vector maps, so bitmap data from Maporama and the like is no good. I have used data from the Digital Chart of the World (http://www.maproom.psu.edu/dcw/), but I'm looking for something a bit more detailed.

Right now I'm making maps for Tibet, but pointers to map data for other countries would be interesting too.

thanks,
-Tim
.

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