TinyMCE es lejos,mejor editor WYSIWYG que he visto, opensource, gratis.
Carácteristicas:

• Easy to integrate, takes only two lines of code.
• Customizable through themes and plugins.
• Customizable XHTML 1.0 output. Block invalid elements and force attributes.
• International language support (Language packs)
• Multiple browser support, Mozilla, MSIE, FireFox, Opera and Safari (experimental).
• PHP/.NET/JSP/Coldfusion GZip compressor, Makes TinyMCE 75% smaller and a lot faster to load.

Lo recomiendo.

Adobe sacó un preview release de Adobe® Flash® Lite™ 2.1 for Windows Mobile 5.0.
Entre las carácteristicas se destacan:

• Dynamic XML data
• Persistent data
• Powerful and dynamc media
• Text enhancement
• Action Script 2.0 support
• Synchronized device sound
• Compressed SWFs

Via: Adobe Labs