I have often been with group of people and need to share some type of wireless. Frequently I’ve used my phone (iPhone 4 – Jailbroken) and myWi (http://intelliborn.com/mywi.html). However, I have not recently jailbroke my phone after the last update.
The main reason I have ever jailbroke a phone was for this feature (a mobile hotspot). In the case where I do have a tethered device and have other people who need access I have started using virtual router – http://virtualrouter.codeplex.com/
Virtual router basically let’s you turn on internet sharing on your Windows machine and make it a hot spot. It is very simple and basic, but get’s the job done. I pair it with a ALFA USB WiFi AWUS036H wifi adaptor that gives me more range. This makes it possible to gather some distant signals.
If you are in a pinch, this tool is great to share wifi.