One year after the Switch, I'm still quite happy with my MacBook Pro (now running Leopard). Although it took me a couple of weeks to get accustomed to the differences in keyboard layout (@, Cmd vs. Ctrl, brackets etc.)...

Pros:

• very beautiful, thoughtfully designed (and fast) hardware and software, great user experience
• changing networks and plugging/unplugging external displays just works (some of these things required reboots on my Windows laptop)
• Unix command line, Mac GUI, Windows VMs - definitely the best of all three worlds
• Spotlight, Finder, Quick Look and the ubiquitous PDF support are a huge advantage over Windows
• I like TextWrangler and iTerm better than similar free software that's available for Windows
• high fun factor; kids love Photo Booth

Cons:

• not crash-free; it's freezed and crashed as often as my Windows XP laptop (although most of the problems seemed to be caused by the third-party ISDN adapter driver)
• it loses the Bluetooth Mighty Mouse every two or three days, I have to search for it via System Preferences (how would you do that on an iMac when your only mouse is not working?)
• the screen cannot be opened wide enough for an optimal viewing angle (my old Acer laptop screen could be opened 180 degrees)
• no free VMware Player and no VMware Console for the Mac (but Fusion is cheaper than Workstation)

Here's the software I'm actually using:

• Apple Address Book, Automator, Dictionary, Front Row, GarageBand, iCal, iChat, iPhoto, iTunes, Photo Booth, Safari, Time Machine
• Adium
• Google Earth
• iTerm
• Jing
• Mozilla Firefox
• Mozilla Thunderbird
• NetNewsWire
• OpenOffice.org
• PasswordSafeSWT
• PHP
• ArcSoft PhotoStudio (was bundled with my scanner)
• Skype
• TextWrangler
• TNEF's Enough
• Tunnelblick
• VMware Fusion

Interesting: Just 13 months ago (as it has been for more than ten years), every laptop and desktop computer in our company was running Windows (with Linux servers and a few Macs for testing). Today one third of the company works on a Mac...