DNS confusion (mine!)

[Gregory Toomey]

This issue is driving me and a few users nuts & I was hoping somebody could
help me out. I'm having a few problems with DNS for float.com.au and
ipo-australia.com

On Monday 21 July I moved float.com.au and ipo-australia.com  to a server at
linode.com . I also started using using www.zoneedit.com for DNS. The DNS
should have resolved by now but some ISPs seem to be resolving to the old
address.

The new IP address I was given by linode.com works http://64.5.53.79/

A traceroute of float.com.au from the University of Queensland
http://www.questnet.net.au/cgi-bin/nph-tr1.cgi   seems to be working:
traceroute to float.com.au (64.5.53.79) from 130.102.5.50, 30 hops max, 40
byte packets
 1  mr2fw-a5 (130.102.5.30)  1.553 ms (ttl=64)  1.068 ms (ttl=64)  1.097 ms
(ttl=64)
... (intermediate steps deleted)
20  li-79.members.linode.com (64.5.53.79)  214.269 ms (ttl=45)  215.121 ms
(ttl=45)  214.742 ms (ttl=45)


But a traceroute from Telstra
http://tcruskit.telstra.net/cgi-bin/trace?float.com.au  resolves to the old
address:
 traceroute to float.com.au (64.247.30.103), 30 hops max, 40 byte packets
 1  FastEthernet6-0.civ-service1.Canberra.telstra.net (203.50.1.65)  0.391
ms  0.436 ms  0.429 ms
... (intermediate steps deleted)
15  64.247.30.103 (64.247.30.103)  292.62 ms  292.844 ms  293.351 ms

I'm no DNS expoert so could somebody point out what could be wrong?
Thanks,
G. Toomey