CrashPlan is offering either a free year of unlimited backup for one computer which normally costs $50 or for up to 10 computers for approx. 60% off ($50 for the year instead of $120).
Valid for new customers in the US only this offer is intended for those switching from Carbonite however the promotion only checks your email address so should be fine for all users.
Microsoft MVP Philip Churchill's MS Windows Home Server Blog is one of the leading sources of breaking news and information, insightful opinion, and great tutorials regarding Windows Home Server. If you're an HP MediaSmart Server owner, this is a can't miss!