I do most of my computer activities on my iBook downstairs, but I like to be able to print to my shared printer on my Power Mac upstairs, and control iTunes on my iMac upstairs, too. I always leave these machines on, but of course, they go into sleep mode where I can't use them remotely. That's where WakeUp comes in - one of the simplest, yet most useful, utilities I've seen (and I use it just about everyday!). WakeUp uses the hardware address of a remote machine to send it a special signal that will actually wake it from sleep mode (just like if you move the mouse or press a key), so when I want to print, I can just wake up my Power Mac and do it - without dragging myself upstairs!
Forty Faces is an interesting website with a single purpose - every time someone posts to their blog, their photo appears on the site. It stays there until 40 other bloggers post, which could be a really short time, but while it's there people can click the photo to visit the blogger's site. I signed up for it soon after it started, and I actually do get a little bit of traffic from it. I like the idea and the clean design, too! If you're lucky (and have good timing) you might see my face there.