Bookends is 50% off until midnight eastern today (Thursday).

EndNote equivalent, but Mac-only, so no sharing with other EndNote users or the Endnote Web abilities (whatever those are). Already works with Word 2008. You’ve got a few hours to test the demo. I’ve played with it, and it looks good, but never gotten around to switching because I fail to put the necessary energy into these programs anyhow, despite having paid for EndNote three or four times.