It is currently possible to watch this, along with several other animes, on Funimation's site. I already posted the link on the board for series one but though this is the place it really belongs:
http://www4.funimation.com/video/?page=show&b=222
I'm only going to say this once: stay out of Camberwick Green - Sam Tyler
Well thank you good friend. Yeah that's where I watched the last 3 episodes of GG2, but funimation's site has a hella slow player. Pretty good show though. Not as good as the first season but a solid series
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You talking to me..punk?
Funimation's main site no longer shows videos to people outside the US, some of their shows including Gunslinger Girl II can be seen on their YouTube channel:
http://www.youtube.com/user/FUNimation#play/user/357456F01FE572D5
They change which shows are available so I don't know how much longer it will be there... I'm still hoping for a UK DVD release.
I'm only going to say this once: stay out of Camberwick Green - Sam Tyler