Hi - lying on the bed typing this on my iPod touch (which does not have 3G) with my netbook in the other room using my Turkcell dongle and some free software called Connectify
A guest is upstairs using a connection as well for her iPhone
I had put a post on about this a few months ago but all I can say is "it works for us" :-)
I saw on the website a reference to "students upgrade to pro version for free" so have a look at that as it gives you even more features (assuming you have a student??) if not use the lite free version.
I don't have an iPad but it will work.
See
www.connectify.meIan
Ps you only need the software on the device that the dongle is plugged in to