Suspect your daughter is taking too long showers? The iSave will give you the evidence you need — this LED indicator attaches to your sink or showerhead and shows you just how much water you're using. It doesn't really save you water per se, but with a running count of the number of gallons (or liters, presumably) you're going through, you might be inclined to save a few. The display gets power from a small turbine in the waterflow, so no worries about batteries or where you need to plug it in.
The iSave is runner up in Metropolis magazine's 2007 Next Generation Awards, but it's got our vote for the worst name of the year award. (Enough with the "i" already! And it's not actually saving anything, y'know.) Designer Reamon Yu could use some help in the naming department, but we still want his concept gadget to catch on.