yeah, it's easy, for the most part. All you need is a webcam that you buy at your local computer store (mine was about $60 USD), connect it to the computer, and most software that comes with it will stream online for you. If not, there are other places out there that create software to stream online with - I use the stuff at coffeecup.com when I use mine.
If you're taking the camera out of the room with the computer, they sell wireless cams, mountable cams, etc... but they're all pretty expensive.
I'm waving at Bosco and Lola right now... they look so comfy in their bed, all curled up together!
I have always wanted to do that but I'd have to put the camera in another room and I don't have that kind of money or time to do it. I'm sure Cooper would love to be on camera all day where people could peek in on him.