I like L-L.ca's and think buying and holding some is a good idea.
Domains with hyphens are used by end-users, so that's all that matters. They are short and good to use for two letter acronyms as you can see in the list above. The public knows what a hyphen is. They aren't geo specific so can be used anywhere in Canada for any acronym that fits the letters.
With hyphens you have to force yourself not to think like a domainer. Solid two word terms with a hyphen, and good L-L and L-L-L are ok with .ca
It was pointed out above that
generally L-L.com are about half the price of LLL.com, and there are only 676 of them. LL.ca go for 2k to 10k+ now, and I think L-L.ca are a good alternative that we see some end-users building sites on right now. Many businesses have two letter acronyms, give me almost any two letters and I can come up with some two word term for them.
L-L is gone in all top extensions, and many country code too.
Even if you hate the hyphen, I'd say close your eyes and reg a few L-L.ca and tuck them away. They'll probably all go this year. N-N too.
All above is just IMHO.
L-L-L even has potential, look at
www.g-p-s.ca
LL.ca NN.ca gone
LLL.ca NNN.ca gone
Next logical to go is L-L
Forgot to add, they make good initials for a personal vanity domain. And everyone has two initials in their name.