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That's the tranny side of the Weir Bellhousing. In this picture, it's pretty obvious that it's much beefier than the stock GM piece. I'd estimate that it weighs about twice as much, not that that means a whole lot! :) 
There's the engine side. I removed the cover plate so that you can see...
And finally, there is the hydraulic throwout bearing in place. You remove the stock clutch fork and use the mounting hole to hold the hydraulic lines in place. There is a supply and a bleed line. They feed through the hole in the tranny for the clutch fork. Pretty slick! :) UPDATE: I ended up discovering that there was a problem with my particular setup and the hydraulic throwout bearing that Weir is using. Supposedly he is redesigning the unit right now, but I believe the problem could still exist. I'm putting information here to hopefully help anyone who might run into this and prevent them from having to pull their transmission as I have had to do this week... In some flywheel/pressure plate combinations, it's possible for the throwout bearing to be too far from the diaphragm fingers. This was the case in my setup. You can determine if this is a problem for you by taking 2 simple measurements. First, install the throwout hearing on the transmission. Then measure from the bellhousing face of the transmission to the end of the bearing (with it fully compressed). This measurement will come out somewhere close to 1" on most setups I believe. (mine was 1.082"). The 2nd measurement is taken from the bellhousing face to the edge of the diaphragm fingers. I put a straightedge across the bellhousing and measures perpendicular to the straightedge to the position on the fingers where the bearing will ride. On mine, that number was 1.34". The 2nd number was the problem one for me. The reason is there should be only about 1/8" or less between the bearing and the diaphragm fingers. Otherwise, the bearing can't push the fingers far enough for a good clutch release. For me, it was closer to 0.26", which was too much. I am getting a spacer to fix this problem when I reinstall the whole setup.
If you want to contact Weir, call Bob Weir at:
Weir Hotrod Products 
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