Networking is an important part of any business and applies just as much to the music industry, whether you are looking for something or offering something.
MusoWiki at first glance looks a lot like Wikipedia, but the key is that it is a wiki for services for songwriters and other musos. It is not for songwriters to promote their own music, but you will find lists of sites for that. There are plenty of sites that can do that already. What it is designed to do is help people find information and support, info ranges from instruments and finding gigs through to legal services, hopefully at the top of the cliff.
Being a wiki, it relies on the support of people in the industry to help populate it and keep it up to date.
This is a very cool site and one that I will certainly be visiting and contributing to in the future. I strongly recommend you have a look too. By the way, if you want to network with me, you can find me here on LinkedIn.