Alliteration alert! Awesome, ambient, addictive and... er... ace. I Found this, linked to, from a pretty rad design and what-not blog. It had me hooked for at least and hour (although I was at work, so wind that in to about 20 mins of normal time).

It's a basic sinewave synth type affair, which, unlike most other "press a few things and make a loop up" type deals, actually makes really pretty sounding loops without an ounce of effort. Judging by the feedback on the site, I wasn't the only one drawn in by it's sound flashing square shaped charms.