Startup Disk Almost Full (but it isn't!)

Hello all,
I've had a problem recently with my iBook G4 where I get a warning that my 'start up disk is almost full' every hour or so. The thing is, when I look at the Finder (or the Activity Monitor) it shows I have almost 8 gigs of hard drive free (and usually 200 plus megs of memory.)
I recently was advised that I needed more RAM, as the person thought maybe system resources were taking up my extra memory, so I put in 512. This seemed to make the problem less frequent, but has not stopped it (it was happening multiple times an hour prior to the memory upgrade.) Incidentally, I do keep my firmware updated.
Also, for what it's worth, I try to keep as few applications open as possible--this will happen when I am only running iTunes and Safari.
I suppose it's not the end of the world to have the warning pop up all the time, but it is pretty irritating.
All suggestions welcome.
Thanks,
Ben

Hey Ben!
What size hard drive is inside your iBook?
It's recommended to have 10% free space at minimum and 25% for "optimal" performance.

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