I think my favourite accessory is the flip-up dog rack in the back. In my parent's subaru legacy you have to unscrew 6 thumb screws and fit the thing somewhere in the car when you decide to put something large in the cargo space. In the v50 you just push it up to the ceiling and you're done.
The miscellaneous storage space is a little lacking I think. Not much room for 2 remotes (no home-link in mine), sunglasses... the storage behind the console is good for the iPod, and the arm rest fits CDs but only if they're out of the case. My old car was a 2000 chrysler neon (movin' on up... ) which had 4cd changer, tons of small storage space in the doors, 3 cupholders up front, room for 10 CDs in the box etc. Oh well.
Has anyone heard of a way to get an aux input installed for an iPod? that would solve my CD storage issues. I have iTrip, but the sound quality is lacking when you broadcast to FM.