If you type "wireless broadband" (with the "") into a search engine it will bring up everything you may want to know.
The term 'wireless' usually brimgs to mind wireless networking between PCs. If you mean wireless access, that usually means using a laptop to connect to a network, such as at an airport/coffee shop etc.
Satellite access is very fast download but uploading is via the phone (56K) and around £15 /month after the initial install price of £400ish.
Yes Sky do it. I guess click here would be worth a look also.