i always thought that laundry mats make good money esp. if they are near campuses, apartments, etc. maybe a laundry mat with a small cafe on the side where people can have coffee and surf the web.
ive also thought of cyber cafe with sooped up pc's that can play next generation games. i know the ones near me cant handle Doom III. its all c-strike with crappy gf2 cards. I know a big banner like "WE HAVE DOOM III", or "WE HAVE HL2" would draw me into a cafe.
back in new jersey there was this place called Fusion-ti. the owner actually has a xanga and website.
www.fusion-ti.com and
http://www.xanga.com/home.aspx?user=fusion_ti the big draw of that place was the drinks they sell and the place was pretty chill. it had a nice atmosphere also. everyone just went there when it was late at night to have a drink, talk, play cards, whatever. and they have a couple computers for whoever wants to play games or surf. it got really popular and he opened up another place. he must make bank now.
good luck on your vision. and if it happens, dood hook me up with a J-O-B. i need one badly.