9000, I tried that, PSM stands for Power Saving Mode. ; )

Anyways, following one1002's lead, I tried messing with the router's settings, and changed it from G only to mixed, and switched from WPA to WEP.

Once I did that, the network performed flawlessly. Three youtube videos, countless forum posts, you name it, I had a tab for it.

This morning I switched back to WPA, but made sure to use version 2. I checked the WPA2 only box in the N900's settings, and it seems to remain working.

I won't complain, but I'm really left wondering just what variable did the trick.