You won't see much difference between the Pro and the Free, but I agree that it's well worth supporting, if only as a donation.

btw, the $'s also go a bit to reward/thank a number of opensource developers who work on the project too. See http://www.limewire.org/awards.shtml IMHO, this is alone enough of a reason to support the Pro.

As for updates--there have been many, especially if you enjoy the beta testing. Take a look at http://www.limewire.com/english/cont..._history.shtml to see just how often these individuals come up with new releases and ideas to play with.