MacOSX.1 is already JavaWebStart enable (aka JNLP compliant).
It could be just fine if limewire was JNLP compliant :just imagine, a single click to lauch your favorite app and zero setup time ;-)
There are already sites that offer lots of JNLP compliant applications.
For instance if you got a X.1 go and enjoy this nice site :
http://www.up2go.net
It is an undergoing site but quite promissing ...
Thanks goes to apple to bundle us such a feature.
/M4C