I've always been a little scared of using Linux, because the last few dozen times I've installed it, it was such a pain to setup and get running.
For my first and only attempt at using linux in 2005, I chose the
Ubuntu distro. It's
debian based so it has this amazing package manager called
Synaptic, that will make it easy to install just about any extras you want (supported and unsupported).
For other distros I've used my biggest hurdle was getting internet to work, and the same problem would have affected Ubuntu, however I decided to use
VMWare to bridge my Microsoft USB Wireless MN-510 onto an emulated VMWare ethernet port. By doing this, when I installed Ubuntu, the internet would simply work (It doesn't really surprise me that linux' support for a MICROSOFT and Wi-Fi USB card is still experimental, however by bridging, it works 100% perfectly).
I've got a nVidia nForce2 motherboard, as well as a nVidia GeForce 5200 Ultra video card, and while these work well with Ubuntu Linux, it is possible to re-compile the kernel to directly add support for these for efficiency. I'm still trying to free up enough time to sit down and specify what I need in my linux kernel (definately all my hardware support, and definately some AMD Athlon XP optimizations).
All in all, Ubuntu is FAST, and software loads at amazing speeds. I've dedicated about 286 MB of RAM and 6 GB of hard drive space to my Ubuntu under VMWare (My computer is an Athlon XP 2800+ w/ 512 MB of RAM and a 120 GB hard drive), and I've got zero slowdowns when switching from Ubuntu back to Windows XP.
Recommendation:
I guess if you don't want to mess with partitions and all that risky business, then just pickup VMWare, download the latest Ubuntu distro, and you'll be good to go for a fast and productive linux experience.