Here are the top reported sales of .ca domains for the past two weeks, from Ron Jackson's DNJournal.com site. The .ca sales fall under the country code section.
Also, at Afternic there was an auction started for SXX.ca, it was around $100 the last time I saw it.
A huge range of country code extensions were present in the sales list, including .de .fr .la .at .nl .tv. .eu .cc .br .nr .ch .gd .es .pl .ag. I think this shows that there is a lot of interest in country code domains, maybe a factor of 'national pride'.
For most countries, the country code extension is as good, or maybe even better than .com, especially if you are using the domain to market within that specific country.