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Hi Daniel! Nofollow links are often used for comments in blog posts, to minimize the amount of "spam-comments-to-get-links". But sometimes you can get a recommendation or an award for something, maybe you have a cooperation with someone, then the nofollow link might come from a high quality site. These types of links will give positive signals to Google and in a long term affect ranking, even if the link has nofollow. Do a good job and recieve recommendations, make contacts and you will get valuable links.

I have a similar problem, 5-10 pages of static content that I need to make look more 'alive' to Google. Sadly I cannot add too much content as it is scientific specific content and I am a mere SEOer! I use the keyword tool on SEOMoz. Find out the keywords for your products, put them into the tool, find out who ranks highest for the words and link to them from the product's 'useful links' page. After a month or so politely email these sites and ask them to link back to you. Simple and effective.

That's a good idea. As far as the calculators, there would be a "powered by" link and it would be iframed, so it would force the link anyway. I like the idea of tools over infographics, because it costs about the same to code a tool as it does to design a graphic if you use odesk or freelancer. I think the tools are more enticing.