Dedicated to the gnutella network (which Limewire connects to) No

There is BitziWeb, but it is being used by several networks and clients, so some work, others do not

To get to bitzi from Limewire right-click a searchresult choose advanced and then Lookup File with Bitzi

Alternative is to go through your browser directly

http://bitzi.com/

More info here:

http://www.gnutellaforums.com/showthread.php?t=57128

The thing in there about the magnet links being to old, is only in some cases.