I bought mine with motors as well, but you'll still need a 3-axis controller board to run the motors. I have a
Xylotex controller which has been good to me and is more than enough to drive the Zenbot (I just hooked up last night...woot, watch that thing fly!!). I actually had to dial down the current on the Xylotex board to not overdrive the motors on the Zenbot since they are rated at 2 amps per phase. The Xylotex boards have a pretty good following and good support, as well as an attractive price. You'll see it mentioned a bunch of times in CNCZone too.
The Zenbot has a matrix of threaded inserts that are drilled into the table. they are actually flanged and inserted from the bottom, so they won't be pulling out easily. I bought a length of 1/4-20 threaded rod from the local hardware store today that I plan to cut into small pieces that I can screw into the threaded inserts in the table. I'm going to combine that with my step block set to make a complete hold down solution. You could also just use some pieces of wood with holes / slots in the middle of them in place of a step block kit to make hold-down jigs with the threaded rod. The main thing is having something to attach to on the table, such as t-slots or, in this case, the threaded inserts.
The Zenbot has almost no slop in any of the bearings that I can see and each axis has very little resistance, so much so it feels like they are gliding on ice. That is how he can get away with using only 75 oz motors. That really drives the speed up too.