Merging NDP and Liberal is extremely questionable. The most significant switches in the last election were past Liberal voters switching to Conservative, most significantly in Ontario. Pundit's Guide has a nice analysis of the "splits":
http://www.punditsguide.ca/2011/05/splits-decisions-a-closer-look-at-vote-shifts-in-greater-toronto/ Many Liberals would never vote NDP, and vice versa. There is no "left-right" binary in Canada. Liberal is centre, NDP is left. Although the author does note that this is merely an experiment, I would assume they didn't judge it an experiment in pure fantasy.
Also questionable is grouping all four western provinces (most analysts only go as far as grouping Manitoba and Saskatchewan and treating BC and Alberta independently) and grouping ON and QC together. The Maritime provinces also have significant differences (NB is very Conservative, PE and NL mostly Liberal - not sure why PE is colored blue), but as they represent fewer seats they are often grouped nonetheless.
The rest of the graphs are interesting.
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