I just had a tough time figuring out how to get a newline into a textarea with selenium core. It should have been obvious, but I was thinking too deep.
Selenium reads the HTML output, not the text of the source. So to create a newline for a textarea, you have to use <br/>!
This reminds me that the other day I tried creating a dynamic test with a PHP file and of course it worked fine. I should also be able to create the test with XSL, which would be terrific.