From Sony

The Sony Memory Stick Micro dubbed (M2) is about 1.2mm thin. The removable media features an eject function to prevent loss. The M2 operates as dual-voltage media. The M2 also provides 3.3 volt operation to allow for operation with existing Memory Stick PRO compatible products.

The Sony Ericsson M600i is the first M2 compatible mobile phone.

M2 sticks can store all the usual stuff music,pictures,video clips ad documents. The M2 adaptor allo0w you to connect to a PC.

256MB and 512MB versions should be available form Sony in about a month or so. Expect 1 GB and up later in the year.