Which ca Domain Names are Available for Registration
Searching available .ca domains is done by using a Canadian who is lookup for .ca domains. These search tools (who is lookups), are offered by CIRA (Canadian Internet Registration Authority) or CIRA Certified Registrars. .
DOMAINScanada.ca is a certified CIRA registrar and offers a search tool for Canadian domain names on their home page at www.domainscanada.ca, and also offers a simple ca who is lookup tool at www.domainscanada.ca/whois.php.
CIRA (Canadian Internet Registration Authority) offers a .ca who is lookup at http://whois.cira.ca/public/.
Simply search for the ca domains you would like to register to make sure they are available for registration. Consider using product names or slogans for your ca domains, often a whole marketing campaign for a web page can be dedicated to this.
There are over 1.6 million .ca domains currently registered (Jan 2011), so if you notice a name you might want it the future, consider registering the domain before it gets registered by someone else. You don't need to use the name in order to register it. If you're not sure when you might use the domain for in the future, leave the DNS information section blank when you register, and ad this information at a later date.
Also consider search terms for your ca domains. Work with your SEO/SEM specialist to find keywords searched frequently in your industry, and there may be words that apply specifically to a product or service you offer, and again a whole marketing campaign could be built around this.