Over the last week or so I noticed that many users are experiencing site downtime, time outs and pages simply not loading. Is the site under attack or something?

Other than perhaps other member's responses who will probably be equally perplexed as you or I, You may want to check out this thread at DAZ-

http://www.daz3d.com/forums/viewthread/40538/

You may be right, from what I gather it is sounding like DNS spoofing, but I really have only a very basic understanding of any of this... of course if someone who can explain better wishes to correct my statement I'd be happy to hear.

And I no longer am recieving emails from shareCG, usually get comments and subscribed new uploads emailed to me but none in the last few days when there should be. Hope its fixed soon.