Terminology resource

That's probably a tired thing - but specialized terminologies like medical, free of charge and well-documented, would probably be useful. Ad revenue, I suppose.

Strategy: microfocus blog

This is a great strategy article. Start a blog in your industry of choice. Cold call prospective customers offering to cover them in the blog; this will allow you to talk to them at length, understand the industry, and give you a positive association when the times comes. It's really a great idea on so many levels.

Reliable hosting

Another startup component: reliable Web hosting. An article from 2009, but the methodology should hold.

Story advice site

I write fiction, and it falls into two categories. Some is "publishable", and some isn't. The "isn't" is more or less pornographic, and while I don't mind sharing it, under no circumstances do I want it associated with my name.

In that second category, I actually have a genre venue with other interested writers, and we occasionally trade unfinished stories. I'd like some of their opinions on stories that are publishable - but I want to retain anonymity, and I want to avoid any publication on an indexed site.

The solution: an anonymized story posting site with attached forum, invitation-only. I post, and I give people specific individual keys to access the story and engage me in conversation about it. I can reveal comments between threads - but only at my discretion.

That seems pretty dang niche. I don't know if there's anything like a market.

Perl Swiss army knife

Not a new idea, of course, and I'm not sure how to monetize it (if at all) but essentially the idea is to be able to write scripts and run them in a GUI environment without much effort. Essentially an App Store idea for Windows. That might actually be the right way to businessize it, too.