I have two of the NSLUs from eBay myself, but I believe that they are discontinued now

I currently run webcams on both of them, as described in these articles (though I am only doing the 'simple' case):

http://johnarthur.wordpress.com/2008...ion-ip-webcam/
http://johnarthur.wordpress.com/2008...kcam-pro-9000/
http://johnarthur.wordpress.com/2008...camera-system/
http://johnarthur.wordpress.com/2008...-lapse-camera/