I think Magnet Links are really a must have. But please don't call them shareaza Links. Magnet Links where there before Shareaza, and they have nothing to do with Mikes Protocol.
Just look here in the cathegory file-magnets:
http://gnufu.net
Magnet Links offer a connection between web-pages and Gnutella, and they allow you to find files, without having to rely on searching (very important, for there are quite some fake files coursing through Gnutella, because some companies are being paid for getting those into the network). For popular files, the best chance to get them is a magnet-link (can almost never be corrupted. That's a 0.01% almost).