The Website limewire is the official website of limewire. If you wish to have LimeWire you can get it there free the software itself is not illegal. The way you use it is up to you but if you are in the US as I am then downloading copyright material is illegal. There are some good stikeys Under the download / upload problems you might want to read.
Below is the link to the official site.
http://www.limewire.com/english/content/download.shtml