It's not just down, it has no DNS entry either.
ping
www.amiga.comPING
www.amiga.com (209.15.183.102): 56 octets data
64 octets from 209.15.183.102: icmp_seq=0 ttl=244 time=434.3 ms
64 octets from 209.15.183.102: icmp_seq=1 ttl=244 time=471.1 ms
64 octets from 209.15.183.102: icmp_seq=2 ttl=244 time=435.2 ms
...
Similar on os.amiga.com, amigadev.net.
Does not look like a DNS problem. Only Apache seems to be down, ftp is still functioning (ftp.amiga.com, ftp.amigadev.net). Which could mean a upcoming website change, which OTOH does not result in 12 hour downtimes normally.
So most probably its just a web server prob or someone from outside shoot the httpd down.
Ciao, Alex