dstiles - 5:49 pm on Feb 23, 2012 (gmt 0)
Hit from a new (to me) Amazon range today:
Amazon Ireland (IE)
Various sub-ranges registered to FR and NL.
No indication in DNS records that this is cloud but the hit I received was from 88.208.193.nnn (Fasthosts dedicated servers) using an Amazon IP as a proxy. Amazon range appears to be named servers. No obvious registration dates.
Chacking further: I had the range 18.104.22.168/17 blocked as being Amazon but not the first half.