When there are a lot of resulting torrents for a search on mininova I always end up resorting them by seeds to force the best results to the top (hurray for the accidental power of the social web!), so I modified the existing mininova search plugin to save myself a step.
Click here to download - or don’t, I really couldn’t care less!

 Installation: Save the file to Mozilla’s “searchplugins” directory (either in the shared application directory or inside your profile), and restart your browser. All done :)