MadeWillis - 4:54 pm on Feb 22, 2008 (gmt 0)

Google does a pretty good job of ignoring the query string portion of URLs.

I highly doubt you will see a noticable difference in your Qscore, which I assume is your main objective here. Adding more related/useful text to that particular page is what would provide additional benefit, but not always possible on a dynamic search results page.

I'd suggest testing a landing page for iPods (vs. using a search results page). Not only would the design look much better, but an increase in conversion too.