Better Reflect Existing Sponsorship Information on the Website
The Tor Project is pretty strong when it comes to financial transparency, but three trivial-to-implement suggestions might make information disclosed by the Tor Project on its 'Sponsors' page more useful to users and other stakeholders:
Linking directly to the most recent IRS 990 form on the 'Sponsors' page ( https://www.torproject.org/about/sponsors.html.en ) could make details easier to access. Users outside the United States, for example, might not know that IRS 990 forms contain certain details they might not otherwise be interested in.
By listing what might otherwise look like end dates on the 'Sponsors' page above, users who don't notice that the information is only current as of 2012 might think that all of Tor's sponsors have left it. Making the "current as of" date more visible on the page and listing something like "2006 - present" instead of "2006 - 2012" might be less confusing. For sponsors offering grants, it seems easiest to just list the expected duration of current grants, where applicable.
If a user only reads the 'Sponsors' page, they could be looking at information up to almost two years out of date (1 year and 10+ months as of today) without checking other sources. To offer users more current information, adopting a policy of disclosing all large grants (above an arbitrary threshold, perhaps $200,000 or 20% of Tor's total operating budget for any given year) on the 'Sponsors' page within a month could make the information users might care about most (who sponsors the project now) more timely and relevant. Relatedly, updating the 'Sponsors' page to reflect the specific date (rather than the year) the page was last updated would better inform users in terms of how recently sponsorship information was updated.