do you guys add a blog per sales page website?

hey guys,

i've been on the warriorforum for 3+ years and doing alright
so far...but there is always new things to learn i realize...for me,
i've recently become more interested in seo in terms of being
attractive to the search engines...

i know for seo purposes, it's great to have content
on your website (including mini-sites like sales page type of websites).

i currently have many salespage type of websites
and would like to make them attractive to the search engines
for seo purposes...

what do you recommending adding to a mini website
(sites that have squeeze page, sales page, upsell page, download page).

is adding a link to my articles good enough?
any other suggestions?
my friend says to create a blog per mini-website...but
i already ahve a MAIN blog for my niche...and don't want
to build multiple blogs per website...rather just add content like articles & videos...


and would it be okay to use my ezinearticle articles and just
copy paste them to my website (or should i have to spin them)?

thanks
BJ