This fellow is pretty amazing: http://beta.ivancover.com/wiki/index.php/Eee_PC_Internal_Upgrades. To the already tiny Eee PC, he added (internally!):

1. USB hub
2. GPS with antenna
3. Bluetooth
4. Card reader w/ additioal SSD
5. Power switch (10 dip) for switching all extra foo on/off
6. Wifi upgrade 802.11n
7. FM transmitter
8. Modem (admittedly there’s design space for that)
9. Touch screen
10. Temperature sensor
11. Heatsink

That’s pretty cool…