Just ordered a couple....
MicroSD offers all of the benefits of Transflash card, but in a much higher speed format. MicroSD is the new replacement standard for Transflash. As an extension of the existing SD card standard, the micro-SD card allows mobile phone developers to design ultra small devices. The MicroSD memory module can be inserted into the supplied SD adapter and used in other SD-enabled devices like digital cameras, PDAs etc.
Dimensions:15 x 11 x 1 mm (L x W x D)
By using the included SD Adaptor it can also be used with SD slot devices like Digital Cameras, PDAs etc.