I really like Expression Web, when it doesn’t crash. It generates standard-compliant XHTML, it’s pleasant to use, etc. But I’ve had it crash many times. It crashes when I have too many files open, or when I edit too big a file for too long.
I need to find something better, but I haven’t taken the time to evaluate other HTML editing environments. I’d like to keep using it if Microsoft would fix the crashes. They have posted an update, but the description implies it doesn’t fix the problems I’ve seen.