This is not quite a hint, hack, or anything, but it's still of interest for those who like me were interested in upgrading their 802.11n-capable iMacs to the rank of 802.11n-enabled iMacs.
Well, I happened to decide only now that I would do that update after many months of resistence. (I didn't have the need for it as my router doesn't support 802.11n, but I am actually thinking of changing my router to a better one, so why not get an "n" one?). To my surprise, the Enabler wouldn't install or work on my iMac, even though it is 802.11n capable. So I looked into some Tech Support Docs, namely this one which describes how to tell if your machine is n-enabled or not.
To my surprise, I found out that when I installed Leopard, my iMac's n-mode was activated automatically! So people with those "borderline" iMacs like mine who never enabled your 802.11n, this is one more reason to upgrade to Leopard -- it will save you the $2 cost of the enabler.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20071116082035631