As an extra I've found a small program that allows you to choose between the four cameras or have all four running at the same time.
Think it's in Visualbasic so you might need some of the run-time files but it works very well.
I've had 4 x448K streams running . You can also double click and any of the feeds to get a full screen image.
To find the file click on the House with the WWW next to it and scroll through the news section till you find the bit about BBNL or try going direct with
http://bigbrotherfan4.tripod.com/bigbrother.zip
I tried a few different ways of creating the download link before I found the one that Tripod/Lycos allowed. They won't even allow the domain name as part of the link which I didn't think was fair.
If you get the program running you'll need a fast broadband connection to use the quad screen mode.
The version I found is V1.0.0.0 so maybe there is a later version but I think the sound could get messy as I think all four tracks are present. Now if I can workout how they have done the four streams at once I'll have a got at my own version to try and get selectable sound.
Any way have fun.