For all of you wanting a longer VDI cable than that provided by Line6 but don't want to get into making your own - try this..
Go online to your (country) local Neutrik parts provider and buy either an NE8MC or NE8MCB kit. This kit allows you to convert one end of a standard Cat5e cable to a VDI type connection - as shown in the attached PDF file. The cost should be around £2.50 per connector (~$4).
This way you can go to your local PC store, but the length of cable (with connectors attached) you want (but less than 50' or max 15m) and enjoy.