That's awsome.
I thought it was particularly impressive, too. It's like a modern case of the Tortoise and the Hare. Go you underdog, go!
Also, ion drives are bloody awesome looking. There is no massive rocket fire or afterburn, just a consistent, eerie, pale blue glow where the ions are emitted. Very futuristic-looking. That's for the ones that emit many ions at once of course.
Im not sure why the article refers to this as recent, unless "one ion at a time" is new. IIRC, there is already an ion driven craft in space right now.
EDIT: Yep, wiki has a long list of real world ion drives under the "Missions" subsection.