I've been able to pickup and use hotspots with my N800 that my Macbook Pro can NEVER see - even with the latest wi-fi fixes from Apple.
Usually I quick-scan with my N95, then if I KNOW something HAS to be out there that my N95 isn't picking up (yes, it's wi-fi strength is kinda weak-sauce) then I whip out the N800 where it usually picks something up.