If Cogeco doesn't have a list, perhaps consider looking at another provider's website like Rogers, which has a list, since the free preview channels are often free on all providers. Check out the Rogers Free Preview thread here at DH too.
Thanks to temporary free programming until Jan 31, 2013 I discovered eqhd, hifi, oasis and have been totally "wow'd". I will definitely be signing up for this package later this month. Out of curiosity I googled what the eq in eqhd stands for but found ziltch. Anyone know? There seems to be a lot of sound dropouts on eqhd, other than that I am very pleased with the diversity of programs.
The free previews are listed on Cogeco's website. They are under the links "Television" and "What's New?" W Movies and Sundance are on freeview until Jan. 31. Letting us know about freeviews through the receivers would be more convenient than having to search it out on the website.