custora no longer uses go daddy
transferred everything away
TicketStumbler no longer uses GoDaddy.
Though the site itself is no longer online, I took GoDaddy's SOPA arrogance as an opportunity to finally move my last dozen or so domains from GoDaddy to name.com; ticketstumbler.com was among them.
Updates for 2011-12-25
Skysheet has dropped GoDaddy and now uses Geotrust/RapidSSL.
yc godaddy list is better sorted now
adding list of YC companies that use GoDaddy