I had a lot of trouble with most of the software out there, yawcam would not do it's thing for me, and webcamXP drove me crazy with the non stop requesters from the system tray, it was like a small child, constantly over sharing because it was doing what it's meant to but just had to tell some one, anyone, or even everyone, every single time!
Then this morning, I found Fwink. This is well worth a tinker with. It is free, simple and just gets on with it. On top of this, it is open source or so the author claims. I'm having mixed results due to truecolour mode, but that can be a bit variable, with some tinkering it gets pretty close to being easy to set up. Lack of bloat is very refreshing indeed. It allows you to specify a save directory and a single file name, you can turn it's FTP off too, and just use Cumulus!
I've written to the author for more details about the open source bit.
I did notice that it makes the Microsoft software break, in that it claims there is another program using the camera when this is no longer the case, and a quick run and quit of webcamXP sets that right.
All in all , this could be a reliably available solution for Cinema users with Win7 Home SP1 64 bit. You don't get to say that very often!
This is where I got it from: http://www.lundie.ca/fwink/
Hope it helps some one else. It is nicely flexible. Needs a tiny polish here and there perhaps, but that's where the open source bit might come in handy for those that can make use of it.