That's a good point you made lisa. SE don't sipider page with uri made of query strings so its good turn the uri into a proper readable uri.
For example:
a url
www.example.com/?article=12345 could be turned into
www.example.com/article/12345.html which is easier for the SE spider to index, otherwwise it will get missed.
Well, if any one intersted to know how that is done. You could do that in the .htaccess file (sititng on your root directory) using a mod_rewite rules to turn any query string uris to proper URIs, given that you are running your application an apache web server.