As I understand it Napster operated as a cental server and thus was ultimately responsible for all the files transferred using it. As some of those files were copyrighted .... ok most of them. Napster was in trouble. Lime wire does not operate like this.
The following is fom the Limewire website:
"LimeWire BASIC is a P2P program for use only in the exchange of authorized files.
Downloading LimeWire BASIC does not constitute a license for obtaining or distributing unauthorized material.
Please do not download LimeWire BASIC if you intend to use it to infringe copyright."
Now there may be those who chose to flout Limewires conditions, and some agencies will say they are acting illegally, which may be so. Limewire is not breaking any laws, any more than BMW are when they sell you a car capable of 150 mph when your national speed limit is 70 mph. If you exceed the speed limit, it is you who have acted illegally, not BMW.
I'm not sure I mentioned the legality of downloading a song onto an iPod
You may well find playable games being shared on Limewire .. but I know for a fact you will find a lot of unplayable ones.