Pretty nice. :)

The only thing I noticed that might improve performance a bit is that this:
for(l in who)
l << "[t]"
could be replaced with
who << t

With large rooms (ok, huge rooms) of people, stepping through the list in DM will be slightly slower than letting the built in functions do it.

i dont see that as realy smart, i mean giving away free code, but i guess some might use it for good not DBZ

I cant realy complain, you gave me my whos playing code.