I tried to stay away from ebooks again, in this edition of DLTJ Thursday Threads (I managed to do so last week), but the threads of announcements and conversations are too crucial to ignore. Just yesterday Amazon and OverDrive announced plans to lend library ebooks to Kindle users. The press release and subsequent discussion is full of ambiguity and missing details, but what was officially said is enough to be tantalizing. And why not? The Association of American Publishers said that ebooks are the leading format among all trade categories in the month of Febrary. At least by sales volume, not by total revenue. The last thread this week is how recommendation engines are finding their way into another corner of the lives of undergraduates — helping you pick your course schedule.