vps tracking

Group intelligence pooling on this one: Looking for ideally a web based, but self hosted tool for tracking VPS, dedicated servers, colos, etc. in one place (for end user / customers - not for hosting business).  Something basic will suffice, but interested in something a tad more powerful that...

Within a year of getting into VPS, I already have four of them. I am sure many here must be owning much higher number of VPSes and could have found an easier way to keep a track of them all. So what is your method of tracking VPSes? Is there a tool like dAgent or a cool Spreadsheet template or...