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The concept of optimizing the internal page for Blue Widgets should be the same as your home page. It should contain relevant links and on page optimization focusing on your keyterm. In this case, blue widgets. You would want to make sure that you use this term in your meta title, description, in the URL and include relevant content as well. The links are only half of the equation. Having a ton of links and no relevant content will be what gets you in trouble with the engines. As long as you have a balance of links and on page content you should be ok.

IT IS NEVER SAFE!!!! GOOGLE WILL HUNT YOU LIKE A DOG HUNTING ANOTHER DOG HUNTING A SQUIRREL! I am so funny. If the pages that link to other pages are related, in the "OMG Bro, I can't believe just how topically related these pages are!", kind of way... then I'm sure you'll be alright. Edited bit: If everything is under the same IP under the same registrant, than I'm somewhat sure the links will be discounted for the purpose of link juice/page rank. However, if you're funneling people to the good stuff, who cares? The sites might not rank any higher, but if the sites are good in the first place, you may increase revenue across sites. Or you may decrease revenues. You kind of have to experiment with that sort of thing.