The built in track pad is convenient and works well, but if you prefer to use a traditional mouse, the Eee can accomodate it.

Please be aware that the Eee's built in mouse software supports up to a 3 buttons and a scroll wheel. It does not support extra buttons or tilt-wheel scrolling.
Logitech V100 Optical Mouse for Notebooks - Mouse - optical - 3 button(s) - wired - USBLogitech V200 Cordless Mouse - Blue ( 931409-0403 )
Logitech V100 Optical Mouse for Notebooks -...
$13.55
The Logitech V100 mouse is a good basic mouse to use with your laptop. It is compact, but not so small as to be uncomfortable....		Logitech V200 Cordless Mouse - Blue ( 93140...

For those who prefer a wireless mouse, the Logitech V200 is a good choice. The receiver conveniently stores inside the mouse w...