A Davies Craig EWP is an Australian made electric water pump. ( They should'a named it Craig Davies, don't you think?)
I got it from Hoerr (pronounced "hare") Racing.
It's a cute, light, quiet little pump (aluminum, 2.6 lbs., flows 2377 gal./hr. @ 10A max) that plumbs into, and is supported by, your lower radiator hose.
With its digital controller I can adjust the engine operating temperature on the fly, and at shutdown the pump (and elec. fan) will run for up to 3 minutes (typically about 1 minute), to reduce the coolant to 14 degrees (f.) under your operating set point, completely eliminating heat soak.
The whole idea is to eliminate the mechanical water pump impeller, which can sap 13-15 h.p.. They have a kit that totally eliminates the mechanical pump on a chevy small (and big) block (and some fords), but not yet for an LS. They've gotta be developing an LS kit, and I'm wondering how they'll reroute the serpentine belt without the water pump pulley.
Being too impatient to wait for a kit, I bought an Edelbrock pump, with a very accessible (and replaceable) impeller and did some surgery on it (an impellerectomy!).
I mounted the controller on a hinged panel under the dash, which can be pivoted up out of sight.
I liked the whole concept of the thing, and now I'm very pleased with how well it works.