HuskyPup - 10:57 am on Nov 10, 2011 (gmt 0)

Canada - .ca
UK - co.uk & com
Australia - .com.au
Germany - .de
Spain - .es
Japan - .co.jp & .jp
France -.fr
Brazil - .com.br
China - .com.cn, .cn & .com
Russia - .ru
Netherlands - .nl

Well, they're the ones I use!

.eu is now a very good one for an international business, it's picked up rapidly by the search engines and, for me, is on par with com/net

I also use .asia for obvious reasons plus .co.in but that tends to only rank in Google.co.in whereas .in ranks well in Google.com

If you're branding don't forget .tel and possibly .mobi depending on your type of business.