Links to possible hardware upgrades

Small MicroSD -> USB adaptor: http://www.dealextreme.com/details.dx/sku.25558 Combine with a microSD card of your choice.

USB Bluetooth: http://www.dealextreme.com/details.dx/sku.11866

USB IR remote: http://www.dealextreme.com/details.dx/sku.27596 Works well with linux/lirc.

Compact Flash : on internal PATA interface

"Big Ears" : external wifi antennae hack