I just received three of the CA-100 "knock-offs" from DealExtreme. My n800 charges fine with it. Also, the connectors fit snug and there is no heat given off of the cable. (There shouldn't be since there are no electronic components to dissipate heat and only wimpy current is passing through the wiring).

It is quick possible that DealExtreme had some "quality issues" with a previous supplier, but it now working with a better one.

These cables are a great idea, since they're small and take advantage of the regulated 5V power supply in the typical PC. Being dirt cheap is nice too.