How much hard drive space does your laptop have? I'm going to guess that it doesn't have more than your desktop. However, if you maxed-out one of Alienware's new laptops, that might not be the case.
Alienware is now offering (and claims to be the first to do so) two 320GB 2.5-inch hard drives in a laptop. Currently, the only notebook that can boast this massive capacity is the 17-inch Area-51 m9750. You'll be able to get the notebook configured in either a RAID 0 or RAID 1 configuration.
As with all good things, this does come at a price. You'll have to dish out $2,400 just to get the base model with both drives. If you're planning on storing a lot on your notebook, you'd better have some deep pockets.