Not that I'm aware of. The Palm LifeDrive has a 4GB HD, and of course you can always use SD cards for additional storage. The largest SD cards that I'm aware of are 4GB, but they cost around $1000 currently.
Just curious, but what are you planning to do that requires 10GB of storage on your PDA?
I own one now.... the 4 gigs cant be beat. Downsides: I wish it was flash memory so it wouldnt eat up as much battery when accessing the data. Otherwise, short of being a cell phone, this little gadget does everything (MP3s, Wifi, DivX movies, photos etc.)