When I was a kid (2001) I worked for my Dad and I used Morningstar everyday to crunch numbers and produce reports. I had a love/hate relationship with it, loving the data but wishing we could make something even better.
Until 2009 I was Editor in Chief for Seattle 2.0 (http://www.seattle20.com) before it was sold to Puget Sound Business Journal, and we made an index of local startups that was quite controversial and got a lot of press coverage and web traffic each month. For a long time I've dreamed of making an index of all startups worldwide, and eventually all privately owned companies.
I performed vendor searches for financial custodians for 401k plans (family biz), PR firms, vendors etc. at Twilio. It's a huge pain doing this research and turning to analyst reports is an expensive solution which doesn't include most smaller companies.
I have been meeting with people to understand what they'd user this for. So far, I have heard interest from VCs/angels for investment decisions, senior executives for buying decisions, and individuals for employment decisions. I think with the creation of Funders Club, Kickstarter and many more new exchanges for private company liquidity there is a need for better sources for due diligence.