Free software package: http://www.connectify.me/hotspot/

There is a version you can buy, but the free version is very functional.

Basically this gives your computer the ability to TRANSMIT a wifi signal, which can be very useful in certain situations.

I find it's most useful where you are charged "per device" for hotel or airplane internet. Using connectify, you can pay for just one device (your computer), and then retransmit the internet to your other devices (phone, iPad, wife's computer, etc).

It is also useful if you are in a place with only wired internet, and you can then use your computer to act as a wireless router for all of your other devices.

It's not all that useful at home, but I've used it quite a few times on the road. Worth a download.