> Contrary to early reports, the Dreamcast 4X Memory Card will not be a full fledged VMU.  Instead, it will just have 4 times the standard VMU's memory for storage.  A normal VMU has 200 blocks, so this new unit will have 800 blocks (or 4 Megabits).  Another feature is the ability to hook it up to a PC in order to down/up-load save files.  Finally, we'll be able to post save files, replays, etc...
     > The 4x Memory Card will be available in America through a company called Level Six via their website (www.levelsix.com) starting on October 7th.  The price ranges from $25 to $29 depending on the number of cards purchased.
(source: GameFan by: Shinobi)