NOTE: (Dec. 2009) This series is back. Check it out.
Last week, Reinvented Software released Together 2.1, a very substantial upgrade from version 2.0 (which I was planning to review).
This release highlighted the problem with reviewing a series of Mac applications right before the Apple Worldwide Developers Conference in June: there's a strong possibility that some of the other apps I plan to review may also be upgraded at or around this event. The moral of this story is that it's best not to start a review series right before WWDC. Bad planning on my part. So, I've decided to postpone the PIM review series until mid-June to ensure I focus my attentions on the latest and greatest.
One final note: I received some feedback on my Yojimbo review from a developer at Bare Bones Software. I've posted it as a comment to the review if you're interested.