*shudder* I have experienced the ways of Nokia and their Bluetooth support. And because of the various Bluetooth stacks used in XP, Bluetooth could be a bit of a headache. Vista is better, in that respect.
I'm not sure how much of it is really Nokia's fault. I used to blame them for the bluetooth headaches, until I started using the very same phone in Linux and more recently OSX, and realised that their phones are actually pretty consistent in the way they communicate. Their windows software are normally phone specific, to match each phone's features (this can be unified and improved so that one data suite will work with all their phones and just give you what the phone provides - they should have done this a long time ago). But the protocols used to access e.g. files on your phone (OBEX) are pretty standard. Windows just doesn't know how to deal with it.
I'm coming to the sad realisation that no matter how much I don't like Apple, MacOX X is a better operating system than Vista; far more consistent and well thought-out than the patched together Microsoft jumble. *sigh*
This goes for their Wireless support too. Each manufacturer wants you to use their own little silly tray-applet to configure your wireless. And this is, again, in part Microsoft's fault. Wireless networking was already pretty popular for a while and it was clearly the way forward, before they woke up and started building support into the OS. And the support in XP is still unreliable, even on non-cheapy quality hardware. I've lost count of the number of recent notebooks I've had to configure that wouldn't connect to a wireless network, can't keep the stable connection, etc unless you use the manufacturer app. One thing it does more often than is acceptible is mis-detect the type of network encryption, even though iwlist in Linux on the same hardware gives me accurate results 100% of the time and the Mac connects as soon as I click on the network name.
On the downside, OsX runs only on one brand of hardware, and supports virtually none of the software I want to run...and the OS is there to run my software, not to be cool all on its own.
That's why it's important that people for who the Mac is perfect go out and buy it despite the small price premium. The more people use it, the more software will become available for it. This is already happening. If apple could achieve just 25% of installed base, it would mean stronger competition and the result of that would be better software for you and me, regardless of platform.
EDIT: To add to that, it's vitally important that people who are interested in or are considering switching to Mac, but are kept back by the applications they use, write to those vendors and express their interest for OSX versions of said software. Otherwise these companies just wouldn't know.