nordnet : https://www.nordnetbank.de/mux/web/nordnet/index.html

… in the view of this author, is a complete and well-priced online application for losing money on german and scandinavian stock exchanges. North-american trading is also available but at a significant mark-up to na broker-commisions; an FX component is included in the main application.

Of all online-interfaces used, tested and seen by this author, nordnet's wintrade application is by far the fastest, most-aesthetic and user-friendly (however, also the most expensive). Nordnet, interestingly, is a swedish brokerage; it's german subsidary was chosen by this author for convenient and language-appropriate trading on german exchanges.  Nordnet DE has migrated to OnVista DE (01NOV2010).