Like others have already mentioned. Ubuntu is a good first choice. I have worked hard over the past couple of years to like linux (;-))and have tested perhaps 8 or 9 different distros.
Ubuntu is probably the easiest to install and is well supported. However I also like Mint and PCLinuxOS. I use Fedora on one of my old laptops and have Debian installed on both my dual-booting SAM Flex and A1-XE machines. I also have an older version of Ubuntu on my Pegasos II.
TrevorD