I have two Omnikey reader at home: Omnikey 3121 and 1021. Both are USB cardreader and can be used with Windows or Linux OS. Omnikeys are very popular because they are cheap and reliable. I am using them with Fedora 14 and pay-tv smartcards. I have only one major complaint. It doesnt support smartcards with Irdeto encryption. But you can use Smargo instead.