We've developed another useful Expression Engine plugin.
This plugin will look at the GET URL variables and redirect the user to the segment version of the URL. For example, http://www.yourdomain.co.uk/template_group/?type=blue will redirect to http://www.yourdomain.co.uk/template_group/type/blue, or any template_group (it can be specified).
Suitable for submitting forms using the GET method for which the form variables will be appended to the URL as a GET variable, but you do not want to use PHP in the template to extract the variables.