Hi Tolman
Those numbers don't make sense over repeated trials--surely something is amiss. If it isn't the ISP, then . . . here's some other thoughts:
Do you have the Dual Processor? There's been a fair bit discussion about a bug with Java and DP macs over on http://www.macintouch.com/index.shtml (search for "Azureus Kernel Panics" ). Someone elsewhere fixed the problem by reinstalling Java.

Reinstalling Java is quick and easy http://docs.info.apple.com/article.html?artnum=120309.

If something is messed in your preferences folder, then an install into a new User Account (make it an Admin) should reassure you that it's not in your Home Folder set-up.

You could also try the CVS build of LW (thanks to Jens-Uwe Mager) http://www.mager.org/LimeWire/LimeWire.html. It also has a "suspend uploads" button which will eliminate that variable.

That's all I can think of for now
[link edit: thanks arne--I forgot to doublecheck those
byw--Gregorio has submitted a magnet patch! http://www.limewire.org/pipermail/co...ne/000457.html]