You have to educate people about the Mac
Long post--but I have to tell my story.
I work in a huge civil engineering firm. I am the sole Mac user in the entire company. I have had quite an uphill battle trying to get my PowerBook on the network. No, it's not a matter of settings etc., it involved convincing my IT guys that I wasn't going to infect the whole network and that a Macintosh could actually connect to a network! These guys are smart people--they know how to keep our network working flawlessly. They just don't know a thing about Macs. Nothing. Zilcho.
When I first got my PB, I just for fun plugged into our network, fired up Dave and boom, was working fine for about a year! No help from any IT guy, just a few emails with the Thursby people.
Then one day, our chief IT guy comes by and freaks out about my evil Apple on his network. He told me to unplug it right there. I went up to his office later that day to discuss the situation. He just could not believe that my PB came with an ethernet card built-in, that it could talk to the NT network, and that I could print to all our printers and plotters. He honestly did not understand. He told me this to my face and asked for me to show him how OS X worked.
I did, and he was amazed that it took all of about five mouse clicks and typing in an IP address to get it working. This guy was actually smiling as he toyed around with it. He was blown away by Terminal. He's an old Unix guru.
The best part was when he asked "but what can you do with you Mac? There's no applications for it." Hmmm. I informed him that MS has a Mac version of Office. "They do!?" I showed him I can also run Window$ 2000 and all of our engineering applications. The guy was sold. He helped me for a couple of hours

trying to setup Window$ 2000 to hit out network and be able to logon.
My point of this post is that most Window$ users truly do not know a thing about Macintosh--much less OS X. Most of our engineers know only what our cocky IT guys or the fools at CompUSA tell them. They bash the lowely Macintosh. They are so wrapped up in this Mhz Myth too!!! The only way you're going to convince people is to show them. Let them play with your Mac. Show them Office v.X. I have yet to talk to someone about computers and have them actually know that MS supports Mac. Show them how simple networking is. Let them hold you PowerBook G4 or iBook!!
Be honest here folks, if you were Joe Shmo who knows nothing about computers and walked into a CompUSA, talked to and trusted the sales guy, would you buy a Mac? Hell no you wouldn't! And this my friends is why 95% of the world buys PCs. And this is why I get frustrated when the only thing people remember about Apple is the new iMac commercial. It's clever BTW, but is it going to show people why they should spend $2,000 for a new Mac compared with $600 for a Dull? Apple needs to SHOW people why they should switch. Thank goodness for the Apple stores at least.