HURF BLURF DUH - 2006-10-12 not exactly a THOOMP. More like a THWANK. Also no indication of damage capabilty. Disappointing.
dr_rock - 2006-10-13 I think the destructive capability is that of whatever you launch (eg. 'nades)
Syd Midnight - 2008-07-16 It's a BFG. The payload weight is 2.2 pounds, so 2.2 pounds of explosive or whatever, with a range of about 700m. Since it has no backblast it can be fired from vehicles and confined areas. At 75mm this is just a miniature prototype, the production version is meant to be 84 mm. It would be good for a portable anti-tank system, or riot control, and I can't wait to see one whipped out in a movie gunfight.