TheBigK, my previous comment was based on very limited information. How the rest of your site is performing is a good indication of any algorithmic penalties that your site may have. Google does take granular actions on specific pages by demoting specific keywords these pages should rank for, but this is normally for pages that have been manually reviewed or contain an algorithmically identified number of unnatural links.
You can always review your traffic stats and compare any drops in traffic to known Panda, Penguin, etc. release dates. But there have been many other tweaks in between the major updates that also have some in the webmaster community scratching their heads as to what these tweaks are targeting.