if you want to read more gunslinger girl up to the end of volume 10 then you can read it online at "Manga Spectrum"
Actually, I bought 7-10 in the japanese from Sasuga books (
http://www.sasugabooks.com/) and after the first few hours tring to get past the first page, I just downloaded the unofficial translations for 7-9 on torrents, perfectly legal since I own actual copies.
Volume 10's translation is not widely availiable, so I'm actually translating it as best I can using a combination of a kanji-search/translation program, Windows Character Mapper, and Babel-Fish.
First, this method is tedious, as I have to find the correct kanji and copy it and the approriate additional bits of the alphabet to babel-fish, then i have to try to make heads or tails of the resulting translation. As they say, Context is everything, and with that in mind, I don't think I'm doing all that badly. I only have the first five pages done so far, though.