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Mozilla composer has a decent css add-on called 'cascades' which improves it somewhat, but its still not a patch on Dreamweaver for most things,
IBM Hompeage builder is a commercial program that uses a custom version of Wine to run version 4 of their Windows version. It crashes too much for my liking, and has a number of CSS display problems. There is a shareware version which carries on working with reduced functionality
Neither can replace Dreamweaver, so I still need a Windows installation to do my web design work.
You could always try to use Wine to get Dreamweaver working (I tried myself, but in true Homer Simpson fashion, I gave up when it didn't work first time)
Proprietary Windows Emulators will get you up and running with a genuine copy of Dreamweaver. but at the cost of some processing speed (not to mention some hard cash)
I'm not a graphics expert, but the Gimp is OK for most things once you get past the learning curve.
Pay no attention to the hoards of *nix geeks who say that you should hand code everything using Vi - they are wrong, we need Dreamweaver for *nix.;)
I'm guessing that you're more of a visual designer. If this is the case it's probably best to stick to Windows, especially if you've gained considerable expertise with Dreamweaver and Photoshop. Messing with Wine and the Gimp's learning curve just isn't worth it.
I don't think it will be too long before macromedia start developing wysiwyg's and graphic packages for Linux boxes, though intially in a more simplified form, than is presently available in W2K.