Two ideas, sort of corporate-customer oriented:

- Output to email.

- Host-it-yourself package.

Established mid/large-sized companies are very leery of sensitive data outside the intranet, and used to e-mail for discussions. They know e-mail sucks badly for that, but it's like keyboards - you're not going to switch layout for each task.

Frankly, I have the perception that internal web apps are for the peons to fill in the little fiddly input form fields (looking at you, HN comment box) - at the top you have emails with thousands of (mostly unread) lines quoted, plus attached presentations and spreadsheets.

Make a web app where everybody can reap results via email, even if only a few bother fiddling with the controls in the browser, and it might be a winner. Might.