Shareaza:

Shareaza is a peer-to-peer client for Windows that allows you to download any file-type found on several popular P2P networks. Shareaza is FREE & contains NO Spyware or third-party products.

Use the power of 4 P2P Networks simultaneously!
Four networks mean access to a wide variety of users. Look no further: Shareaza's got it!

Download from multiple sources
Experience downloads the way they were meant to be: fast! Shareaza swarms across four networks!

Sophisticated file-hashing
Say adios to corrupted files and mp3s that skip. Shareaza detects and fixes corruption before the download completes.

Find that file with Global Searching on Gnutella2!
Search the entire network, not just a part of it. Shareaza will find you that file!

Multiple results tabs
Each search is displayed in a new window. Your search results will never be overwritten. Shareaza runs the searches you want, when you want!

Previews, users comments, and ratings
Get picture and movie previews right from the search panel. Even view comments and ratings written by users like you. Shareaza ensures you avoid those fakes and download the real deal!