After racking my third blade chassis in a rack with the help of another person (and then looking at the space for the 4th chassis in the future)...I'm looking at investing in a server lift!
a quick google search reveals that there is one mainstream product...made by ServerLift. Are there any others out there?
There are other material handling devices that can be useful for lifting servers -- search for stackers, lifters, and lift trucks. Mcmaster.com has a few pages worth of manual and electric models. There is also quite a variety here http://materials-handling.apluswhs.com/lift-trucks/. We've been using one like their HMW500 for many years. This should give you some ideas.