Check that apache is listening on that ip by checking netstat and also check the virtual host to make sure it looks right.
Check if you can connect to the ip only too.
Edit:
You are missing an AAAA record.
Check your spelling.
http://ipv6-test.com/validate.php
; <<>> DiG 9.6.-ESV-R3 <<>> @elsa.ns.cloudflare.com dev.saundersinsignia.com AAAA
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5168
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; WARNING: recursion requested but not available
;; QUESTION SECTION:
;dev.saundersinsignia.com. IN AAAA
;; AUTHORITY SECTION:
saundersinsignia.com. 86400 IN SOA art.ns.cloudflare.com. dns.cloudflare.com. 2012010110 10000 2400 604800 3600
;; Query time: 25 msec
;; SERVER: 173.245.58.111#53(173.245.58.111)
;; WHEN: Tue Jan 3 15:44:41 2012
;; MSG SIZE rcvd: 100