Keep in mind that we are continuing to support Front Page extensions. We still have many clients using it and we would like to keep that available to the customers for as long as possible.
It might be worth noting that, even though we are continuing support for Frontpage, its like a 10yr old technology, and Microsoft does not natively support Frontpage on IIS7 (even though they just released a new version [Expressions].. wierd, but its microsoft).
I use Eclipse, CFBuilder, FlashBuilder (Flex), Notepad++, and VisualStudio Web Development Express.
Eclipse is a PHP enviornment (natively) however, it has many different 'flavors', to include java, and other different programming languages.
CFBuilder is a new IDE put out by Adobe for ColdFusion 9. Its actually built off of Eclipse, and its pretty sweet (as much as I am not a huge fan of CF, because it is not very forgiving)
FlashBuilder (Flex), is also released by Adobe. FlashBuilder 4 is in beta versions and is a fun tool. I am currently designing a navigation bar and some other things for a friend. Its worth noting that FlashBuilder builds its content into flash plugins, and therefor does not play nice with SEO. But you dont really need the SEO to pick up a navigation bar, so I like it for that.
Notepad++ is my choice of code editor. It uses color syntaxing, line numbers, and is extremely light weight. Its just all around good.
Visual Studio Web Development Express is my ASP/ASP.Net C# IDE. Im sure most of you are familiar with this.. Visual Studio 10 / ASP.NEt 4.0 is in beta right now... Im signed up for the beta program, so hopefully I can get into it... Maybe talk Ryan into throwing up a ASP.Net 4.0 beta server

Also, Dreamweaver isnt terrible. I mean, its pretty universal, and it just uses FTP, so it isnt like we are going to get rid of that anytime soon.