I use a Clie NZ90 - uses Palm OS 5 so is perfect for GTD. Wait for it though......has a 2 Meg digital camera built in. Admittedly, a TT is somewhat smaller, as are most other PDAs to be honest but this PDA is the first PDA I've had that goes everywhere with me. That's the crucial difference it's made - any idea I have anywhere can go into this machine. Perfect !!