I learned that I can't run our wireless network on channel 1. That's where the interference is, even though my bridge's site survey says nobody else in the neighborhood is running any access points on channel 1 either. Crappy ping results across the bridge on channel 1 (>1400ms returns, lots of packet loss), quick results on channel 6 (<4ms returns, no packet loss). I get better response on a channel that I know at least one other access point is using. I blame it on 2.4ghz cordless phones.
I learned that SMB (CIFS) file sharing support in Ubuntu isn't great. The ReadyNAS supports NFS, so I can use that instead. It works much better.
I'm trying to figure out if there's a way to get better performance out of VLC Media Player and/or MPlayer. Right now it looks like the Pentium III/800 just hasn't got the oomph to render high bit-rate wmv or h.264 video and keep in sync with the audio. Of course, it didn't when I was running windows (well, not the h.264 at least). Any clues?