Wordbook's English-Czech Dictionary - Bi-directional translation. Combines Czech with English and German, Spanish, or French. - http://www.wordbook.cz/index.php?int_kod=en
NetTown - English-Czech and Czech-English on-line dictionary with a text-area. - http://slovnik.nettown.cz/
Multilingual Dictionary - Multi-directional service including Czech, English, German, French, Italian, Spanish, Russian, and Latin. - http://www.slovnik.cz/