I use BackupPC to keep backups of just under 300 web servers and development machines. It keeps track of all my backups and can run many jobs concurrently (I run about 30 backups at a time on a quad CPU backup server). I store the backups on NAS, and even restoring 2TB of data can be done in a couple hours. The program is getting better all the time and is now my exculsive first level backup for my network. Great job!
Getting much better
I love the new .11 releases, I've been playing with Zina for a long time now (since 0.9) and it has improved steadily to the point where I think it's now the best overall free streaming software. I'd love it even more if it had it's own authentication, but I can make do with apache's configs. I have used Zina on windows/IIS, windows/Apache, Linux/Apache1.3,2.0 and 2.1, and Solaris/Apache. My collection consists of over 56000 songs, and Zina is one of the few apps that doesn't explode when it sees my music folder. Great work!