SUMNERG  Deep application by a responsive developer. Tinderbox can do many, many things for confirmed geeks as well as more casual users. Alas, no Unicode support, so you're out of luck if you want to work with Chinese, Japanese or many other languages. Also not a "universal" native Intel app; still runs under Rosetta with, some users report, less than optimal results.  
(Version 4.6.1)

SUMNERG  Great for saving, organizing, and retrieving just about anything.

Select text from a webpage in Safari, drag it onto Eaglefiler's drop pad, and Eaglefiler saves the text. Quite a few competing programs do this or similar. But Eaglefiler goes one step further. It also appends the source URL to the text you've dragged. That way you'll always be able to refer back to your source.

In addition to unusual touches like this, Eaglefiler makes it a snap to tag items. And you can easily add icons of your choice to the tags. The icons are great for spotting items in a long list.

You can take a minimalist approach to organizing. Or you can add structure by putting stuff in folders nested several levels deep if that's what works for you. Unlike with Yojimbo, which imposes a philosophy, Eaglefiler leaves it up to you.

Eaglefiler is also a great email archiver. And so much more. The developer is incredibly responsive.

Highly recommended.  
(Version 1.1.2)