Good (& Free) Helpdesk and Asset Management Solution

I spent a long time looking for a helpdesk solution for one of my clients. Afterhaving evaluated a number of solutions (Web Helpdesk, IRM, Cerberus, SysAid) I came accross this little gem.

It has everything my client needed:

Helpdesk ticketing (including importing directly from an email account)
Web based
Asset management
Consumable management
Comprehensive network documentation features

It also integrates with an LDAP server (for example Active Directory) to allow users to login, view their tickets, create more tickets, etc.