Well for Playstation alone there's an apparent wealth of games beyond the obvious Time Crisis, Point blank and Die Hard games (all of which are D pad playable in one or other Ps emulator)
http://en.wikipedia.org/wiki/List_of_light_gun_games 27 games possible.
Protoman isn't too guilty though, as theres only been a few inconclusive threads on this topic, which a search may have found between the forums.
http://www.gp32x.de/board/index.php?/topic/58243-ps1-lightgun/
http://www.gp32x.de/board/index.php?/topic/50070-snes-or-mame-emulator-with-touchscreen-as-mouse-or-lightgun/ wiz
Regardless, it would be nice to implement touchscreen for these games and those on any system that is emulated, Alien 3 The Gun on Mame, Duckhunt, Snatcher on PicoDrive etc. With an X stylus to see whats going on, these games would a blast on a train trip or similar.
As has been mentioned before though, for modern TV's the tv out cable would be useless anyway, as they simply dont register lightguns from PS2 era and below. I did once see some PC based USB lightguns that claimed to overcome this and make Mame possible but I cant find the company at present.
RE4 is awesome on both Gamecube and Wii and for Wii it really worked (except the sniper section which seemed better on GCube). I was sorely disappointed with RE5 on 360 though, as it was simply no progress on 4 bar gfx and the narrative was poor. In addition the lack of motion aiming, coming from the Wii version, probably also made it seem to suck more.
The Wii isnt great for such games though, (I've yet to try Ghost Squad) but it kinda works for House of Dead + Overkill and I'm enjoying Goldeneye 007 but it does have serious control issues. The cover system and 'snap to' that works so well in COD4 etc, just doesnt always work in Wii Goldeneye, so Daniel Craig pops up and snaps to the nearest piece of art, ceiling, or floor decoration of supposed interest, rather than the guy in your face with an AK47.
I sat out the original Red Steel and it again kinda works, whilst Far Cry was god awful. I've yet to fire up Red Steel 2 but I gather its alot better, though short.
The PS3 Move is potentially alot better prospect but I cant help thinking with the gun attachment I will be wanting that glowing ping pong ball to fire at the telly like the old toy guns. It looks ridiculous. I hope it can prove its worth of fixing, or re-buying a new PS3, as they are scarily expensive for a machine that wishes largely to download updates, and melt its own motherboard and YLOD itself.
Why is it I'm on my 2nd Wii, 4th 360 and soon 2nd PS3, whilst my megaCD, PCFX, Saturn, Dreamcast, Gamecube etc still work whenever I dig them out the attic? Manufactured obsolescence?
As for old systems, ONLY the Dreamcast got it right (Perhaps the Saturn but mine is attic based, so cant check) in that you plugged the damn thing in and it required zero calibration, it simply worked. Xbox may have mirrored this on HOTD III, but the handy breakway cables function to stop your kids ripping the console off its shelf, also means you've probably packed all the non wireless controllers away in the attic, repleat with their end of the actual cable! Or perhaps thats just me :angry: