I'm currently working on a piece detailing exactly why Zengobi's Curio has become a favorite of mine, especially in the area of project management and brainstorming, but also in general as a truly enjoyable-to-use application. In the meantime, though, I thought I'd better get an announcement out for version 5.3, released today. For those unfamiliar, Curio is a note-taking, brainstorming, to-do managing, file-gathering application which works in a (surprisingly productive) free-form manner. It's similar in concept to Circus Ponies Notebook, but I find it to be even more flexible and powerful.
Version 5.3 adds to an impressive feature list with customizable print headers and footers, the ability to convert lists to mind maps and vice versa, as well as an importer for AquaMinds NoteTaker. Detailed release notes are available here. Version 5.3 is a free upgrade for all Curio 5 users, and upgrade pricing is available at the Zengobi store. The regular version of Curio is $99USD, and a Pro version is available for $149USD (find out what the difference is here). Academic discounts are available, and a free 15-day trial can be downloaded on the Curio page.