they get to a certain percentage...like 91%, and they won't go any farther. it still shows that they are d/l ing and at what rate, but the percentage complete never changes.

This particular problem has been reported many a time before and it seems that the best way to resolve it is to disconnect using the selection under the File tab on the top of the screen, then to reconnect.
If that doesn't help then do the sure-fire way I use whenever this happens to me (rarely): quit Limewire then relaunch the app again and presto, the downlaod will seek sources and finish downloading almost immediately.

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-