Stikkit is a new web service in the same organizational vein as Backpack, but it employs some pretty wild tricks and technology to help get your productivity on. The idea behind Stikkit is to get rid of the manual page organization that locks you into one form of hierarchy or another by allowing you to create simple text notes, and organizing your information by watching the language you use in these notes. Tags also play a heavy role here, but for example: if you start writing some ideas down in a note, but then start a new line with "buy eggs," Stikkit now knows you just created a todo, and it automatically lists that note in your todo section, but it can also list the note in your bookmarks section if, say, you add a link to a site you need to visit at a later date. Stikkit is also smart enough to catch notes with a person's name, phone number and IM name, as it will then file that under your peeps section as a contact card. It's a pretty wild system that I urge you to check out, and they have a few screencasts listed on their main page to help you get your feet wet.
But why am I telling you all this, you ask? Well, Stikkit is gaining some pretty impressive Mac OS X integration that makes using this service a real dream. First up is a 'New Stikkit Package' created by Nik, one of their enthusiastic users (found via DF). This bundle of tools allows you to create a new Stikkit via AppleScript, your favorite app launcher like Quicksilver or LaunchBar, and even a Service (you know, Apple Menu > Services) which lets you create a Stikkit from text selected in almost any Mac OS X application. It's a pretty handy bundle that offers a lot of flexibility in how you work with Stikkit.
Another really impressive integration trick this service has is accepting drag and drop calendar events from iCal. I found this screencast on Stikkit's blog which demonstrates literally dragging an event from iCal onto a new Stikkit note in a browser, and the note collects all the info it needs like the name, date and time of the event, and even any notes you might have added in iCal. I was impressed to discover that this even works with Firefox, where traditional Mac OS X drag and drop goodness like this tends not to play.
If you've been looking for a handy online PIM to store your stuff, Stikkit is a great option, though due to its unique technology, it might take some getting used to. I urge you to check out their screencasts to get started, and then move on to cool tools like Nik's package if you catch the bug.