LD will be taken back up as soon as the argument with Asuka over X is over; both X and LD were being published by Asuka, so LD stopped when X stopped.
And apparently there are supposed to be about 15 volumes... CLAMP said in an interview that they'd only done 1/5 of the series they'd intended to do. Which is awesome. Now if they'd just do it.
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The question of Kei is interesting... Kazahaya says to her in an inner monologue, "If we had stayed together, it would have been either you or me." So... he left to save Kei's and his own life? If he wasn't around, Kei could live, but if he stayed one of them would have ended up dead? Might they have even ended up having to kill each other, a la Battle Royale? (Creepy...) It does imply that one of them would have been chosen for something that Kazahaya at least didn't want to do.
And... a friend on LJ and I had a conversation about some of the mysteries surrounding LD here. (http://community.livejournal.com/gouhoudrug/30516.html) It's full of spoilers.
Yes, the argument was over content. Asuka doesn't like X's ending.
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The shapes in xxxHOLiC are almost certainly supposed to be Kei, Kazahaya's sister, and Tsukiko, Rikuo's... someone. Yeah, we don't know what the relationship between Rikuo and Tsukiko is yet.
And there's a lot of conversation about the similarities between Kazahaya/Rikuo and Watanuki/Doumeki and the series in general. Some of it is worthwhile, but I think the case can be overstated, myself.