I use dm-crypt on all my machines now, including laptops, to provide full-disk encryption. I also use it to encrypt swap partitions with a randomly-generated key. All of these are features that Ubuntu 10.04 provides out-of-the-box, at least when you use the alternate CD to install. I also recently installed µswsusp on one of my laptops, a userspace hibernation facility. I didn’t really connect the dots until one day I left the laptop running, coming back to find it hibernated.