the 1000XB has been gone for months. It was on back order forever, now just not on the store pages.
The 1000xb is the same light, but w/ accessories (spare bulb, pocket clip, lanyard, carrier for spare batteries and bulb, rubber sleeve).
I have a 1000XB-LE, ended up getting it for free (thanks amazon) and wanted to get a 1000XB-AE. I found one place that says they have them, but I wanted to hear what was up from Jeff before I ordered it.