Keith Devens .com

Something else to look at..

Personal Brain from http://www.thebrain.com

Also, MyInfo: http://www.milenix.com/
I paid the money for the registered version, the print format is a let-down.

Yet another: Leo.

I use emacs + emacs-wiki.el, which works very much like wikidPad, it seems. If you know emacs I would highly recommend it; I myself use it to keep notes. Look here.

I've been evaluating NetManage ECCO Pro, which is actually a discontinued product from around 1997 (!) but is still pointed to as one of the best PIMs out there. I think it was killed by Outlook, but has a supportive user community (http://www.compusol.org/ecco/). NetManage made it available for free download and I gave it a try and I'm really impressed with the caliber of its UI. It has a particularly powerful and fluid outliner + table combo that I've not seen anywhere else and would love to see in a modern PIM. If you like editing, viewing and generally working in outlines (vs e.g. headers plus lots of body-text notes), it is the best UI I've seen for it.

I also evaluated wikiPad and like it, but it doesn't have enough outlining features for me to consider it seriously. However, wikiPad's scripting seems promising and I'd love to see some sort of hybrid solution. I'm not sure how easy that would be given that ECCO is definitely structured in its input whereas wikis tend to be more free-text, but it is very nice.

Finally, you might check out these Outliner use patterns if you want well-categorized review of outline-oriented PIMs: http://www.atpm.com/9.12/atpo.shtml

I use a program called "The Literary Machine". It is great for storing, recalling, and organizing loose bits of info. It has a learning curve, but it is well worth it for me, given that I have not seen a program that can match it.

forgot to mention that The Literary Machine is free. You can buy the professional version but the free version is fully functional and sufficient. It is great for developing a powerfully integrated body of personal knowledge.