If you're looking for helpdesk software, I'd recommend you take a look at Web Help Desk. It really is excellent software and there is a free edition which allows one Tech user to use the software. There are paid for licence options too if you need more Techs, but the prices are very reasonable.
You can check it out here: Unipress Software - Help Desk Software by Web Help Desk
The site also has another product called LANrev which can tie in with Web Help Desk and allows you to automate the management of Macs and PCs... worth a look!
Good luck,
Jam