Others have already been answered, so I'll take a stab at these two.

iii) How are the meal services on CO? I tend to notice that main course servings on North American airlines are plain embarrassing compared to Asian airlines.

Probably not as good as Asian carriers, but the CO transPacific food was better than NW's. May not get anything on IAH-YYZ unless you are flying at "mealtime." It's an inside joke with regard to pre flight video.

iv) I've read generally positive reviews of CO, but wish to know if there is anything I should look out for?

Ya, watch out for Barbie's Dream Jet, believe there's only one 737 a day between IAH and YYZ.

Also, regarding the locks on luggage. Homeland Security allows them to break the locks, so if you don't want damage done to yours, don't lock it. One of the reasons why Iberia and other European carriers are bypassing MIA on their Latin American routes.

Inflight entertainment on CO over Atlantic consists of three or so movies and some TV shows, believe they're big on CSI. These run at the same time, and repeat every two and a half hours IIRC (it may be less), so if you start watching a movie and don't like it, well

Oh, and no free adult beverages on CO unless you are up front, even across the Pacific.

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