I'm coming in a little late here, but I hope this is helpful.
For the past month or so I've been experimenting with pc-based cameras for when I'm not at my farm, which is about 3/4 of the time.
This has been very inexpensive for me, as I already have DSL and a computer at the farm. (I can't get DSL at the house, but one building is close enough to a main highway for me to set up a little office there.)
There are three parts to this: the camera, the software running on the computer that controls the software, and getting the images over the internet to someplace usable.
The camera I am using is a Logitech QuickCam Pro 9000 that I bought on Ebay for $83 delivered. I'm very impressed with it. I also have a Logitech QuickCam Express that I bought years ago, you can get them now for $10-20. My software supports multiple cameras, so I decided to hook it up for fun. It works pretty well, but the picture quality is not as sharp.
The software I'm using is called Image Salsa, you can download it for free from
ImageSalsa - The Only WebCam Software You'll Ever Need!. If you use the free version it puts "Demo Edition" in red letters across your pictures but is otherwise fully functional. For $19.95 you get a password that removes the text. Image Salsa will merge several cameras into one image, and has motion detection and some Internet utilities.
The hard part is getting images off the computer and onto the Internet. There are lots of options, but all are imperfect. Image Salsa will upload a picture to a web site for you at the interval you specify. I'm using a free web site called Weather Underground, and sending an image every five minutes. Here is a link to my camera:
Wunder Cams : Weather Underground
(Right now this isn't the farm, it's my city house where I'm testing all this.) The top picture is the expensive camera and the bottom picture is the cheap on. Weather Underground always displays the most recent picture, and for every day they keep a noon picture and take all your pictures for the day and combine them into a video. This isn't really useful for security, but it's good to let you know what's going on. I'm also running a weather station and they support that as well.
The motion detection in Image Salsa only saves to the local hard disk. This is fine if you just want to check it after the fact. What I've done is set up a scheduled task to upload all of the motion detection shots to my web site once a day. Image Salsa also contains a built-in web server, so you could run a website on your computer, but it seems too limited.
If you would like more detail on what I'm doing, PM me.
Thanks.