Recently faced a problem with Jquery and Rich Text Box in Sharepoint.
I had to get the value of the Rich Text Box into a variable and manipulate / use it.
Searched internet a lot for the possible ways to do it. No luck there.
Finally turned to MSDN, Rich Text Box documentation. Spent 3 hrs reading it and than finally came up with a working solution.
Here is the link for stackoverflow of my posted question followed by a solution ::
Hope it helps someone else also. :)