A basic but brand-name phone that might also be good as an emergency backup. Unlocked means you can keep your number and keep your SIM, and there's no nasty contracts of course.
This is part of their 24-hour Monday Madness sale so it might not be around for much longer…
Update: Shipping is no longer $2, but this is still available with shipping at $6.95
Further update: Shipping is again $2 until 11:59PM Tue 23/02/2010 AEDT.
Or it can serve as a projectile weapon if you ever get robbed ;D