Hey this is new for me too but.
I believe you need to install from a SDHC card and from the camera card slot in a laptop.
You would need to set the BIOS to boot from the card or the disk # appropriate to the card.
To use the card again in a camera you will need to reformat it in camera so keep a dedicated card.
In Vista " ready boos"t suggests the card must be the same capacity as the installed computer memory to work correctly.
For installing an os to the camera slot SDHc card that would probably apply .
Traps : If you *fail* to UNMOUNT any flash USB drive or some card readers in Ubuntu it will not reboot as it still thinks the drive is mounted.
Plug the usb back in / boot to previous system / unmount the usb /reboot / Ubuntu will recover to the default previous system.
Thats some of what works for me but I havent tried the install from The SDHC card yet wiating for some one else and doing research.
Toshiba satellitee dual core 300, 4 gigs ram 500 gig hdd drive in two partitions Vista pre installed.
P4 intel 2.6 2 gigs ram 2x hdd Ubuntu 9.04.