I wish to provide a followup to my previous comments. I have reconciled my differences with the developer and am on better terms with him -- several have written me that their primary reason for using Bookends was his incredible support, so my experience was definitely not the norm.

Mac users are lucky because there are at least three strong contenders in the area of bibliographical management software: EndNote, Bookends, and Sente. Over time I continue to gain a better understanding of the complexities of these programs, which really must cover several distinct areas: Formatting bibliographies (and interoperability with various word processors), reference and attachment management (in the app), online searching and downloading, and note-taking.

No one program is perfect in all areas (nor will one program suit everyone's needs), but at this point in time, Bookends is probably the strongest contender overall. Bookends continues to be improved at an incredible rate: 10.1.1 is already as much of an advance over 10 as 9.1/9.2 was over 9; the inline reference editing introduced in 10.1 is wonderful.