Sorry to come in late,
we just got our hands on 'On Time' by axosoft, still figuring it out. We got the program from another project which was killed by the client, so it was targeted for a Visual Studio team, but hey we got it now:
Multi-user Yes
Multi-project Definitely
Web based It has a web interface, which is just like the windows interface
Open source No
Good performance across distant networks Should work, it has his own web server were you can log in on
Inuative interface Not really, however I only looked at it, but I think it covers everything
Comprehensive reporting functions Definitely, it looks very powerfull
The manager who bought this is used to work on SIL4 level programming so the documentation of stuff is very well coverd with this program. The single user version is free! We are starting using this program in the next month or so. It has integration with MS Visual Studio and SourceSafe, I am not aware about subversion.
However it is rather pricy.
Ton