I used FreeTextBox for quite a while, but recently got fed up with it's little oddities (very picky about versions, which makes it hard to update).
I've switched to FCKeditor and use the provided asp.net control.
The only thing I prefered about FTB was the single dll distribution (it's not really possible with FCKeditor), but it meets my needs otherwise, plus it avoids all of the problems I had with FTB.