i have been using the xss_terminate plugin:

http://github.com/look/xss_terminate/tree/master

basically it sanitizes values before they are stored in the database:

"Installing the plugin creates a +before_save+ hook that will strip HTML 
tags
from all string and text fields. No further configuration is necessary 
if this
is what you want. To customize the behavior, you use the +xss_terminate+ 
class
method."

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