Earlier I hinted about getting something involving lasers.
On a bit of an update I'd like to clarify that I got one of these, as well as one of these.
And yeah... especially with the latter, the pew pew pew of a laser gun is actually very accurate.
It's an insert for the chamber that activates a laser every time its hit by the firing pin. So yeah, it turns any gun of the right caliber into a... laser gun.
Combine it with the first link, which is a target that is sensitive to laser light you have a very neat dry fire device. It's really handy for doing draw drills and checking your press out, and your sights.
Very easy to install and setup. I'll see about getting some photos later on.
Edit: A couple more thoughts. There are a couple problems with the design. One is that to replace the batteries you have to unscrew the backplate of the target. And you'll want to make sure the batteries are firmly in place.
Also the sensor for the reset is very precise and you may get the most precision aiming by trying to hit it to get the thing to cycle to reset.
And finally, because you're just activating a laser there's no recoil. So there's that limitation. It's very good for draw and first shot, but does nothing for flinch or managing the recoil for followup shots. In fact it would do one to concentrate on making sure your grip is still good, as it's easy to start limp-wristing your grip.
Still, all in all, a very handy training device.