My three killer apps:

1. Excel
2. Aqua Data Studio (I’m a DBA). This app rox. The company I work for has many different DB systems and this app can talk to them all. No need to install the client for each DB.
3. BBEdit

Without these three apps I am nothing.

Honorable Mention…. Quicksilver (Still learning but I lika alot)

Emacs is my killer app. I love how I can reprogram practically every aspect of it. I use it to publish my blog, keep my task list, do my mail, manage my contacts, sometimes even surf the Web. Not bad for something that’s officially just a text editor… ;)

I also totally, totally love Firefox, particularly with extensions like Greasemonkey. =)

I am a really techy user of Excel. I use a genetic algorithm add-in to doo all sorts of optiziation and regression work. For the genetic algorithm work I also use the frequency and histogram functions to calculate information theroretic values such as Shannon entropy and Mutual information for use in the genertic algorithm applications. These applications include stock picking, portfolio optimization chemical structure design, selection of the best training sets for self-organizing maps I also use a lot of neural network add-ins for Excel.

Flock. I’ve happily given up Camino, endo, and ecto… primarily because Flock runs so well on a 17” MacBook Pro.

I am new to GTD, first introduced to it here are 43 Folders, recently I picked up the book, GTD.

I know most of you are Mac Centric, but I have a Windows computer at work and home (although recently set up an Ubuntu Linux machine at home)

I would have to say categorically, hands down it would be Outlook. I know that many people frown on Outlook, but it is what my employer has us use. I sync up the Calender and Contacts to my PocketPC. Honestly, I like Outlook, but have not really used many other corporate email systems. 9 or so hours a day it is open.

Also, lately I use a Word based ToDo list that I am tweaking to my needs. Also, it’s not really an APP, but my flash drive goes everywhere with me and I keep any files that I need for projects.

I am a huge fan of excel as well as it used for many project at work, or more accurately parts of projects. I like to tweak the formatting.

Circusponies NoteBook. I live in a handful of notebooks. I have 2 for overall view on projects, where clipping snippets from mail/safari etc is priceless (set up GTD-style). Then I have one for each major project for keeping notes, etc.

I think that when you by habit try keyboard shortcuts from one app in another (with sometimes strange results), then you know the app is becoming an extension of yourself.

As a Linux programmer, my vote goes for:

1) Vim - coding, text editor 2) Gmail - stuff 3) Tomboy - GTD 4) Firefox - browser and WYSIWYG CSS Editor (the web developer toolbar is awesome)

Can’t believe nobody mentioned Tomboy. It’s the perfect app for lists, linking, project management, etc.

I’m going to have to agree with mwschmeer - I positively adore Mori. It’s all I need for all of my class notes (from both lecture and text), project and meeting notes/outlines, to do lists, etc. I also always have netnewswire and quicksilver open.

My vote would go to my favorite online gtd system: http://www.vitalist.com

Also, of course, Gmail. Thank god I don’t use outlook anymore!

Another vote for Smultron here - love the ability to save groups of text files as projects and easily navigate between them.

Can’t live without: Mail (with Mailtags) - Safari - Ical - Quicksilver - OOP w/ kGTD - Smultron - Textpander

Honorable mentions: Notlight - Textpander - Shrook