I downloaded LimeWire 1.5 (Linux tgz and Windows), and I'm currently running the tgz (I already have JRE 1.3.1 installed, so there was no need to install it twice!). In my computer (Win98SE) LimeWire runs smooth, no problems at all. If anyone is interested, to start the Linux version you can create a bat with this:

javaw -cp .;LimeWire.jar;collections.jar a.a.a.b.Main

As I said I'm running v1.5, without any problems. Only the system tray doesn't show any icon, and does nothing at all. BTW, I have installed Swing extensions in JRE 1.3.1, I don't know if they are required for LimeWire 1.5