It would seem a handful of users are seeing stale DNS data from when we moved to a different server a couple weeks ago. I've checked and all of the name servers for www.zcar.com are advertising the correct IP address. Unfortunately the DNS issue is specific to your ISP, they appear to be caching stale (ancient) DNS records.
On the positive side, I'll be moving zcar.com to a different IP soon so hopefully that DNS change will coax your ISP's DNS servers to pull down current data.
Thanks for the knowledge Derek. My ISP provider for my cable internet and phone really suck arse. We are having so many problems with line drops and XBOX 360 hosting, on the high note they came down and changed every cable connector on the property and the power line connectors so that has boosted our internet speed, but didn't solve much. We never had any problems with our old house and the ADSL 2+ connection.