Sirius is meeting XM’s challenge in the portable satellite radio market with the Stiletto 100, a pocket-sized device that has the dual functionality of giving you satellite radio and Web radio in one. That’s a lot for the little Sirius dog to deliver, yet he does.

The Stiletto 100 can store up to 100 hours of MP3s or WMA files (but not AACs). You can store up to six-hour blocks of radio broadcasts and, of course, pause and replay live radio, up to 44 minutes’ worth. Online downloads are possible through Yahoo Music Jukebox.

You can get a Stiletto 100 for just US$349.99 here.