I was a long-time Dreamweaver user, all the way back to DW4 (DW4UltraDev was the first version to provide database facilies.

The extortionate upgrade costs started getting to me, so my last version of Dreamweaver was DW8. I made the switch to Aptana (standalone), and I'm very happy. Occasional bugs happen in the code, but they get fixed (normally) quickly. For the price (free, or $99/yr for Pro version), I think it's the best out there.

I played with Eclipse for a little bit around Christmas - Eclipse is the base platform for Aptana - but I ended up staying with the stand-alone version. For me, it just seemed more stable.

One caveat - Aptana is purely a code editor. There is no pretty 'almost-wysiwyg' such as offered by DW. However, most of my day is spent deep in the further recesses of PHP, so I never miss it.

Before you can ask what to use you need to know what your role and needs are.

For example, dreamweaver and dreamweaver like tools would never work for me because I do software engineering and those applications don't have the types of tools I need. Rob Feature uses Coda for development. That works great for him in front end development. But, it lacks the features I need for back end development.

So, what type of work do you do? Are you a coder? Do you write modules? What languages do you work in? In order to recommend the right tool for the job.

I switch between 2 tools. I use eclipse pdt and komodo edit. I'm considering buying komodo ide.

Like Matt said, more info would be helpful, but I've had my eye on Bespin recently: http://bespin.mozilla.com/

Not to divert the topic, but I just watched the video - that is some amazing editor and collaboration tool!

I think your development environment is going to depend a lot on what you are coding, as others have mentioned. Do you need debugging? Do you need a rendered page preview? Do you need syntax highlighting, and for what languages? Code folding? Synchronizing with a SVN or CVS repository? What OS are you using for your development?

I have tended towards open source or freeware and also things that are available on different OS platforms - PSPad (www.pspad.com) has always been one of my favorites, but only runs on Windows (but can run from a USB drive). I've started working in Eclipse, and there definitely is a learning curve, but it is quite powerful and flexible.

I'm hopelessly old school, I guess. I'm a real fan of BBEdit. Gives huge amounts of support for the coding I do.

I have TextMate for text editing and StyleMaster for a CSS editor. I still have an older copy of BBEdit that I used to use.

For my day-to-day development, I use a combination of TextMate, Coda and VIM. Bespin does look cool, but it's just not quite "there" yet.

Mainly for front end development. I am not a coder though I have grown up on php, C++ and C#. I am always curious to see what others are using and what tools they have in their toolbox that I don't.