Thanks to Jack and Christofer for the detailed info! Just to let all know, Ubuntu must have fielded a bit of flack as they posted a security update for the linux kernel, I downloaded it and that seems to have fixed the problems I was having.
On a related note, I'm leaning strongly towards Oren's idea of having separate drives for OS and data as a means of preventing future problems. I want to be able to fiddle around with the OS without endangering all of my files and this sounds like a good way to go. Once I get another drive installed and make everything work, I'll post the details to the list.
Once again, thanks!

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"When the going gets weird, the weird turn pro..."
Raoul Duke