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if you're concerned about DNS taking a long time, shorten the TTL (Time To Live) in your older domain's zone file a while before you make the actual cut-over. The TTL value tells other DNS servers how long to cache the zone.
if you have access to a Linux or UNIX system (or even cygwin) and can run the 'dig' command, you can see how long your TTL is set to from the command line:
dig domainname.com SOA
domainname.com. 86400 IN SOA ns1.foo.com. dns.foo.net. 2009100200 28800 7200 604800 86400
that first 86400 after domainname.com. is the TTL for the zone. 86400 seconds is 1 day. 3600 is one hour - but this may increase your domain's DNS traffic on your DNS servers...
after the cut over, you can always change it back to a bigger value.
hope this helps...
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