I know this is a Linux forum but I have a program - that never got much fanfare (that I'm aware of) for Win32 but I love it. Its a free program that SAVES snapshots when it detects motion - and you can control how sensitive and how frequently to snap shots during motion.
I've caught some interesting shots when I set it up before.
The file names when extracted is: Surveillance Scan II.exe
The zip I downloaded is named: sscanii.zip
I personally don't use it much - I don't have a need - but I have in the past and I keep it saved just in case. A real gem.
If you cannot find it - I'm sure the author would be happy to allow me to give you the file. Its freeware after all.
Jason P Sage