Some one pretending to be Hauptwerk is much worse.
No worry, this is not the case (both extensions, .CO and .COM are valid). Recaptcha was added later (once Hauptwerk.com was up and running and some .CO pages remains). The .CO link is coming from a page that no one is "usually" clicking (and the error was never reported); it was reported by Ed today. So no worry, no one is pretending to be Hauptwerk and the page is good.
**** EDIT 15 minutes later - While I'm no Webmaster, I corrected the page, all links are now pointing to .COM pages ****
About the ipad not displaying correctly on your iPAD, we know that some users are having this problem, but for most it is working correctly . The problem has been forward to our webmaster a while ago and correction were made but it seems that it' still affecting some people.
The same thing for error 503... also reported, but not critical. If you retry a few seconds later you will access the website (again the webmaster is aware of this problem).