I have been a Windows user from the time I was a little tot. I am still a Windows user (and am perfectly happy with it), but sometimes I look over at a Mac and wish I had just a few of their features on my Windows machine. After doing some searching, I have been able to find four applications that give me the few things that I wanted to have on my Windows PC but has traditionally only been available on a Mac.
As you can tell, Rocketdock is an application launcher that functions in the same way as the Dock does on Mac computers. I have always really liked the Dock on Macs, because it helped keep your desktop and task bar clear of clutter that can get built up over time. Rocketdock also has several docklets available that allows you to customize it to your liking.
RocketDock has been previously mentioned on Make Use Of, such as Tina here.
Widgets have always interested me with their ability to keep you up to date on whatever you want while still being hidden behind your desktop. A simple press of a hotkey opens up a world of tools and knowledge. Yahoo! Widgets allows you to bring this functionality to your Windows XP PC. There are almost 5,000 widgets available from Yahoo so you will definitely be able to find what you need.
Expose has always been such a nice feature on Macs that serves as a great alternative to alt+tab. Alt+tab has traditionally served me well, but as I have gotten more and more into being a geek, I tend to have more and more applications open at the same time. This can make alt+tab not as useful when switching between windows or applications. DEexpose2 brings great expose functionality to your Windows computer to give you an alternative to alt+tab.
Quicksilver was the first keyboard application launcher I ever heard about, but it was only available for Macs. Quicksilver allows users to quickly perform many different types of tasks through just a couple of keystrokes. In early 2007, Launchy was released and brought Quicksilver-like functionality to Windows XP. Since its release, Launchy has received critical acclaim, and it was also recently written about on Make Use Of by Shankar. You might also want to check out Enso Launcher that was covered by Jimmy. We also talked about it in latest MakeUseOf Podcast as well.
What Mac features would you like to see brought over to the PC?