I was just on the website www.boingo.com. It is a network of WiFi locations. I found this when I was looking on the Linksys website at the WRV54G. That site was https://www.linksys.com/products/product.asp?grid=33&scid=35&prid=565.

For a commercial application, you may want to go with something higher-end, as mentioned by the others, but this Boingo site may also provide you with some other ideas.

I have also seen some hotspot-type equipment at www.us.zyxel.com.