I do a lot of django and drupal development so I use screen, vim, terminal, hg/git/svn, virtualenv and MAMP. I also use firefox with firebug, and the Live HTTP headers plugin, and virtualbox for virtual windows and linux environments.

TextMate and RubyMine (Ruby and Rails), Eclipse (AppEngine, Wave robot dev), IntelliJ (Java), AquaEmacs and SBCL/Franz/Gambit-C (Common Lisp and Scheme).

For documentation/writing: OmniGraffle and Latex (and sometimes Page or OpenOffice.org)

I use xcode, textmate, cyberduck for sftp, gitx for basic git usage, terminal for most of the heavy lifting, vim on servers. Photoshop when needed to tweak something minor but mostly I am a programmer.

I tried using Aquamacs for a long time, but it didn't work out, and I just switched back to 'plain emacs' now that the mac version builds out of cvs. I also use iTerm, Fabric, django, mysql and svn.

I use SubEthaEdit or TextWrangler depending on what I'm writing. SubEthaEdit has better syntax highlighting for some things, including Go, but TextWrangler acts more like I want it to.

My most common applications in my workflow are Coda, Terminal, and Fireworks for the occasional graphics editing. Also, XCode is a big player when I'm doing my iPhone development.

How do you like Coda? How well does it adapt to rails/django? Is it only for the front end stuff or can it handle the heavy lifting of the server side stuff?

TextMate for code and SequelPro for MySQL. The rest is built in: Terminal, Apache + PHP. Also, I off-and-on use Things for task lists (now I'm back on using TODOs in Textmate).

In addition to the Xcode tools, I use MacVim, MacPorts and iTerm. People who do more than quick edits with Vim on OS X should have a look at MacVim.

This has saved me a lot of time: http://infinite-labs.net/afloat/

Textmate and Eclipse. I use vi for quick editing.

I also use Virtualbox for running virtual Linux and Windows (for testing)

I use a mac but the tools are pretty much the same as a linux box.

ITerm + Vim + various Gnu Utilities

I develop (rails) on a mac - I use textmate and terminal

I use Coda and MAMP.. and they do everything I need

Terminal, Vim, Cyberduck, and photoshop.

Keepin' it simple folks.

Aquamacs is fantastic!