ADRIANBOLT  http://www.macupdate.com/info.php/id/10785/notational-velocity

Notational Velocity has an excellent minimalist approach if you want something even more focused.  
(Version 0.9.3)

PHALERON  It does not seem to work on 10.4 any more.  
(Version 0.9)

JOACHIMR  This is my preferred note-taking and storing application now. The previous descriptions are well done, so I don't need to repeat them here. But the point of simplicity cannot be made often enough. SB allows you enough "complexity" where needed (RTF for the notes, keywords), but stays simple enough compared to such applications as NoteTaker or NoteBook and does not force you to follow a certain structure (as the date-centered focus in Journler for example). A crucial point for me is the openness of the system. You can get all of the information out in various formats (either individually, or grouped after you have tied together some information), you can intuitively and intelligently browse through your own thoughts in a manner you never envisioned before (which is the whole point of using tools like that), you can search for your notes though a simple Spotlight search, you can search your data on your computer based on your notes (again through Spotlight) - this tight integration with core Apple technologies makes this a 5-star app for me. I have tried them all and for me as an academic, with ideas and notes being my core asset, this is the one that allows me to make the most use of my own knowledge. Oh, and it's free and takes up so little space (on your hardrive and RAM) that it can (and should!) run all day on your Mac. Give it a try. Read through the sales pitch. You will love it if you want a simple approach that yields very powerful results.  
(Version 0.7.3)

MADMAXMEDIA  This is an extremely promising app. The main feature of the app is its ability to automatically sort and group keywords for you, presenting them in a collapsible outline-type view that frees you from having to outline yourself. The flip side of course is that you must tag your entries appropriately. Performance with large number of entries does not seem to be a problem on my MacBook.

I have always envisioned having a notes/ideas program that was essentially unstructured, yet allowed you to process or view your data in different ways. The way this program works largely allows you to do this. This is a very sparse and simple app. In general this is a very good thing- this is a far cry from kitchen sink-type apps like Circus Ponies Notebook or AquaMinds NoteTaker, but runs nice and lean. A couple of extra small features here and there would help maximize the usefulness of the app IMO.

The main thing I would like to see is better tag management features, since tags are so important in SlipBox. Renaming or deleting tags (as you can with labels in GMail), and being able to batch process entries would greatly improve usability. The ability to assign tags to multiple marked/selected entries is important for people importing lots of information from other note/PIM apps. I have literally hundreds of entries in my old app, and not being able to apply even some general tags to batches of related entries is a problem.

I waver between giving this app 4 and 5 stars. With some extra polish it is definitely a 5 star app, but the promise alone warrants the rating IMO.  
(Version 0.7.3)

ANONYMOUS  It launches and works with Panther 10.3.9.  
(Version 0.5)

LISA  I really love this application - I have found two uses for it (so far!): 1) It is a great recipe database (with ingredients and course as keywords - the best I've been able to find, free or otherwise!)and 2) I use it as a reference database for articles that I have to read for my work. Well done! A few niggles, though: I can't seem to make my preferred fonts (set in 'preferences')stay in place once I quit the program (they revert to the 'factory settings' on next launch) and I can't seem to get the program to open in my default slip box on my G3 mac at work.

Once again, it's a fabulous application - Well done! And thanks for making it free!  
(Version 0.4)

BKUESTNER  Even at only version 0.3.1 this app already stands out from other note taking apps:

One standard features well done: Keywords and source information for your notes are easily and transparently assigned.

Most noteworthy: Most other note organizers are either flat, or they require you to build your hierarchy. SlipBox however automatically builds a useful hierarchy of your notes from keywords.

Current issues for 0.3.1:

- No way to tab between the various entry fields

- Stores all information in one file, i. e. not Spotlight-friendly

- Does not allow attachments of files (maybe the underlying format should be HTML and not RTF?)

The first one should be easy to fix. The second two might find a solution if the file format is a package, i. e. a folder with multiple files of any kind.  
(Version 0.3.1)