258's quality is pure evil....that is all. I wish magazine scans would stay consistent.
JS06 has released the translation on mangahelpers (258 and 259 too), so those in a hurry to read it should check it out (if they can find the raw to read with it)
EDIT (5/23/2011): Two more pages to clean! Almost there! 259 is getting worked on, too.
EDIT (5/26/2011): Currently typesetting both chapters.
EDIT (5/28/2011): We will release both chapters with Kara no Kyoukai 7.