The device I want: a computer keyboard with built-in storage or support for a memory card or flash drive. It can be used as a normal keyboard with a desktop computer.
You can also take it away from the computer and put it into "note taking mode". In this mode, you can type and it records your typing. When you return to your desktop, you can tell the keyboard to play back your notes and it sends them to the computer as if you are typing them.
Optional feature: a one line LCD display so you can see your typing in note mode.
This gives the speed of typing, without the distraction of a laptop.
You can also take it away from the computer and put it into "note taking mode". In this mode, you can type and it records your typing. When you return to your desktop, you can tell the keyboard to play back your notes and it sends them to the computer as if you are typing them.
Optional feature: a one line LCD display so you can see your typing in note mode.
This gives the speed of typing, without the distraction of a laptop.