The one thing I always hear when people switch over from Windows is this:
I can't use my favorite application X to do Y, do you know a solution? Some of the time I say yes, there is a Linux version and sometimes no, but you can try Wine.
Wine is a Windows emulator designed to make those “hard to live without" Windows applications work under Linux. At http://winehq.org you can find a list of software that is supported. It has tips on how to get the software to work.
Utorrent, for those who don't know it is a torrent client used to download torrents. These are files shared through the Internet between two computers, also called Peer to Peer sharing or P2P for short. This can be any file but most people use this for downloading music, TV shows, Movies and software. While this might not be legal in every situation, torrents can also be used legally. Kubuntu and Ubuntu can be downloaded directly off the site or you can download the torrent of kubuntu.org. Another example is SXSW, a conference held every year that features amongst other things a music showcase. Every year they release the music showcase via torrent, usually a file that is around 3.5GB, which is full of music and new artists. There are many more torrents to be found around the Internet like this. For legal torrents, check out legaltorrents.com.
Utorrent, or µtorrent as it was originally intended to be spelled, is, next to Azureus, probably one of the most popular torrent clients for Windows.