A new drop of MacSword has been released. It includes a number of interesting enhancements. Two that stand out, in my opinion, are the new and greatly improved search syntax, and the ability to see different Bible versions and/or commentaries in parallel.
UPDATE (21:00 PM): I emailed the developer (Will Thimbleby) and pointed out a few bugs I had found (e.g., Strong's searches didn't work). He fixed the problems and posted a corrected version (1.2a). I plan to update my review of MacSword soon.