I have a full Soya trunk mirror running (updated every 5 minutes) at www.soya3d.org now. This is useful for both the source browser and branching (for those without GNA! access).
Unfortunetly, because this isn't a full mirror the revision numbers are out of sync. A full mirror would require setup from GNA!'s side as well as some directory rearrangement on both ends so all the data can exist harmoniously.