According to a slashdot posting, Crossover Office has made Dreamweaver and Flash work in Linux.
On a side note, let me mention that I have two machines at home, a linux server and a dual boot which inevitably stays in Windows. Dreamweaver was a big reason for this (as was time–I haven’t gotten around to backing up and storing files) as well as Musicmatch and maybe Windows Media player for some of my DRM content. I’m going to take a long weekend to move things over.
Also worth pointing out is the list of Mozilla extensions which add a lot of functionality to the browser. In both windows and linux.
I have the same issue with my Mac. I put bootcamp on it a while back and find myself on windows more than I like.