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however, your example should not present any problems; .com is effectively the 'international' suffix. All you'd gain by moving your hosting to the US is better value hosting, almost certainly. Though Canada is a lot more competitive than the UK. Which isn't competitive at all.
Targeting US - ideally, use a .com and US-based host
Targeting UK - ideally, use a .co.uk (or .com) and a UK-based host.
Check that the host IS in the county it claims. Some major 'hosts' use servers with IPs that are from a different country.
A .net was originally devised for firms such as service providers.
So, it's IP of the host which plays the main role.
I rock on a .ca search... too bad I can't ship there.
Actualy .net was ment ONLY for players and not subs ;-)
Origioanly it was for network infastructure use (a bit like a civilain .mil) domains etc and only telcos ISP's and so on.
Now It's a generic TLD so the same rules apply as to .com's ie host in the target country.
Back in the day a .net email adress implied a certain l33t'ness.
[edited by: Simsi at 4:36 pm (utc) on Sep. 27, 2006]
I moved my .com to the UK last month and traffic has gone crazy. I can only attribute this to the fact that I'm at #3 on Google when selecting 'pages from the UK' and searching for my main (65% of all SE traffic) keyword. Having a dedicated server is obviously beneficial speed-wise too.