
Posting on the web is good as long as one can save and print copies of the forms. Here is a good FAQ about the disclosure requirements.
Materials, resources and information related to the California Association of Nonprofits' finance and accounting programs and CAN's Accounting Boot Camps.
The organization must explain (in Schedule O) the process, if any, it follows to have officers, board members, committees, or management review the prepared Form 990, when that review happened, and the extent of the review. The instructions clearly say “If no review was conducted, state ‘No review was conducted.’ ” The IRS does not require or recommend any particular procedure for reviewing the Form, but most organizations will want to ensure that their senior staff managers and/or the board committee responsible for overseeing financial policies and procedures have a chance to review the Form before filing.