I recently came across a free web based application (which still runs locally) that allows you to monitor your network, create a helpdesk, and converse with other IT professionals. The best part of this application is that it is completely free. I tested it on my company network and it has been very helpful in discovering devices on my network that may need additional maintenance. I also have joined several Spiceworks community groups that allow me to ask questions and correspnd with other IT professionals near me. Download a copy here.
I had my doubts when I read that it was free, and even more doubts when I read that it was web based, but that is really just for integrating the web based community with the application, as there is a local database for your network content that stays local only.