WYMeditor: web-based XHTML Rich Text WYSIWYG Editor
http://www.wymeditor.org/en/
The CSS and XHTML Lab | 456 Berea Street
http://www.456bereastreet.com/lab/
How to correctly insert a Flash into XHTML
http://www.dgx.cz/trine/item/how-to-correctly-insert-a-flash-into-xhtml