I have a Pioneer DVR-A03, which does DVD-R and DVD-RW, and CD-R and CD-RW.
I did get it working in Linux for free, here's how
(thanks dex) I'm not sure if the free dvd patch works in *BSD. I think FreeBSD has DVD support, so it might. If not, you can pay Jörg Schilling $100 for the commercial version of cdrecord-prodvd, which will work anywhere cdrecord does.
On this drive, DVD-R is 2x (2760KB/s) and DVD-RW is 1x (1380KB/s). The one DVD I've burnt so far was 3.6G and took a little over an hour.
The process is pretty much exactly like burning a CD. Since nothing requires you to use udf, it's easy to use mkisofs and more compatible that way.
Seems like a good backup medium to me. It's supposed to last over 100 years, although they can't possibly know that because DVD hasn't been around for 100 years.