Have the same issue with F17-beta release. no Wifi. Couldn't find it. Strange . . .uses same drivers that all the previous versions had little or no trouble locking onto. Same key etc. Gave up and re-installed F16 KDE.
I think it's an issue with the most recent kernel release as it worked perfectly before I updated. The issue is not severe at all IMO since I just have to unplug my wifi adapter and plug it back in to get it to work.