I am preparing to add WYSIWYG editor to one of my project and looking for some library code to use. The selections narrowed down to FCKEditor and TinyMCE. Both of them look great and perform nicely in the demo. Now comes to the question which one to pick. This article has a nice comparison between the two.
Just found out that default editor in WordPress is also based on TinyMCE, which is quite an endorsement. I particularly like the capability to resize the editor’s size in TinyMCE.