Great tool ! It doesnt show up in start menu, because it is started via command line, although it has a user-friendly interface. Fully agree with rwtabber, additonally its always a good idea to read the manual.
I use the version from kismets site, as the Ubuntu repos have stoped updating it. Everyone who sais they can't find the application should not be using it.
Kismet doesn't show up in my laptop, and I cannot find Kismet anywhere in my laptop. It doesn't show up after I restarted laptop either. So I think this app is useless.