Sony Europe officially announces today the highest capacity Sony memory stick as of yet - the 4GB Memory Stick Pro Duo.

Sony Memory Stick media are available now in capacities ranging from 128MB to 4GB depending on their format Memory Stick, Memory Stick PRO, Memory Stick PRO High Speed and Memory Stick Micro.

All Memory Stick Duo and PRO Duo media comes with a standard size Memory Stick adaptor to enable use with standard size Memory Stick compatible devices.

Sandisk has their 4GB Memory Stick Pro Duo already in the stores.
The new Memory Stick Duo line-up with the new packaging design and inclusive adaptor will be introduced in Summer 2006.
The 4GB Memory Stick PRO Duo media will be available from summer 2006 and will cost approximately 170 Euro.
More details in this Sony press-release.