I've read this and it's quite good. A chick at NYC Resistor showed it to me.
I am making a tankbot game by mounting a laser tag gun on the back of tracked bot. You would make 2 remote controled tankbots, a 4'x8' course and then you can fight 'em. I'm currently building the second tankbot and having second thoughts that the game will suck.
For human laser tag, you might as will just buy 'em: http://www.amazon.com/Hasbro-92692-Lazertag-System-2PK/dp/B0026J7EIO/ref=pd_sbs_t_2
They are only about $30 per tagger and quite good.
The one improvement they could use is a hat/head sensor. I've been thinking about hacking them.
We play in Central Park, NYC sometimes. My liberal wife does not like shooting the children