I first began dual-booting Gentoo Linux with Windows XP Professional around November 2004 or so. However, I practically picked XP every time so nothing really came out of that.
In February of 2005 or so, my notebook got stolen so I got myself a new one. This time around, I wiped the computer after I confirmed that it booted (into Windows XP Home) and installed Gentoo on it without a dual-booting option (yes, by wipe I meant a complete wipe). I've been using Gentoo as my primary operating system since then and have never tried any other distributions, so I can't really comment on them.
I recently split off a section for dual-booting purposes since I was getting prepared to play
Dreamfall. Unfortunately, the game doesn't run on my crappy notebook. :P The XP partition is still there though, but I don't boot into it much.
Jam it back in, in the dark.
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Hiro