deegree has been using OpenStreetMap as a background map for a couple of years now in its layer preview. That's already quite nice, but there's so much more that can be done with the OpenStreetMap data. To make a start I've begun to set up a workspace that makes use of OpenStreetMap data imported by using imposm.
To set up the data, I just followed the imposm tutorial. The workspace is configured using the production table schema, so make sure you run imposm --deploy-production-tables once you're done importing the data.
The workspace is located in the deegree svn (deegree-workspace-osm), so if you want to have a look, go ahead. It uses the GeoServer styles that were used in the FOSS4G benchmarking 2011. It still needs a little tweaking to improve the map quality (labels and stuff), but the styles worked out of the box. The labels along roads/waterways seem to be repeating without taking the gap configuration into account, so analysing the deegree renderer here seems to be in order.
Apart from that, this enables you to create your own maps based on the OpenStreetMap data. The new workspace is the place to start, you can just adapt the styles for your own needs or create your own layers any way you want.
We at Occam Labs plan to provide an online demo using the German and Dutch OSM extracts from Geofabrik. We already did some tests on these datasets, and the result was quite promising. So stay tuned for updates on this one!
Edit: Forget the comment about the deegree renderer not taking the gap into account. It didn't, but now it does, another successful Bolsena bugfix ;-)