Eliezer keeping his notes where I can access them is altruism. It does NOT make him more efficient as Nornagest was claiming, and might actually waste quite a lot of his time.

I'd want him to keep them in whatever format he feels is best - keeping them in his head might drastically increase his productivity, and we'd all benefit. Even being altruistic, it's still a risk-reward tradeoff, and I trust him to make that decision better than me (he knows the factors better, and I'd wager that he's smarter and more rational than I am about such things anyway)