Just reviving this thread in case anyone was considering signing up for X-CAD. It looks like they are at 99,200+ and will hit the 100,000 mark today or tomorrow. I went ahead and signed up yesterday but only gave them my name and email NOT my phone number so we will see what happens. I figure the worst that will happen is I can send their junk email to the spam folder.
EDIT: Looks like X-CAD = Alibre Xpress
http://www.alibre.com/xpress/news/press-release.asp