i have read through a lot of this post and would like to make a couple of observations
i am sure this bloke knows loads about marketing and no doubt some of his advice can be applied to this country
but
he is talking canadian dollars so that $400 house equates to 200 quid or so
if the window cleaning business in canada is like the states then it is more like once a year than once a month for a clean
on that basis the 1150 dollars of work for 34 fliers equates to 3 jobs
done once a year :
so thats a sub 10% take up
good for leaflets but not unheard of
my best response was 5 out of 21
right place right time,sometimes it happens that way 
this marketing practice is probably portable and applicable to us over here but needs to be viewed in perspective
Good, let's do some math.
2 brand-new jobs, as follows:
House 1:
Ext windows + gutters $277
House 2:
Ext + Int windows + gutter $875+ (cant remember exactly)
That's $1150 in IMMEDIATE work.
In this area, most have their windows and eaves cleaned twice/yr.
So, if I can keep them happy (so far so good), that'll mean
$2300 in 2009 from them.
From 34 little fliers printed on a home computer and printer on a Thurs afternoon in November.
Make sense?
Not to mention the additional stuff I could up-sell and cross-sell, and the neighbours we'll target in 2009, too, using these guys as leverage to earn more local trust.