For the last couple of days I've been hooked with Shatter (http://www.shattergame.com/). I just lvoe it!Arkanoid has NOT been bested, but at least I think it's the best Breakout variant this side of Krakout. It's a shame it's on Steam - I'd actually like to pay for it, but there's no way I'm jumping through Steam's hoops...
I thought I'd share - it's definitely worth checking out!