Check your Google Webmaster Tools and see if you need to use the Parameter tool. There are settings there that you can use to tell google not to index parameters. You can also confirm that Google is not under-indexing your site, in which case you don't have to worry about the parametered URLs at all. If you have canonical tags in place that will do the trick.
If Content is King, Quality is Queen!
2/11/2011 2011 may turn out to be the year the search engines finally conquer the "quality" problem... at least I hope so. There's been much recent buzz about Google's announcement that they are taking steps to take on the "content farms". This bodes not...