The SIAI does publish no progress report

They do do various things like that from time to time - e.g.; http://singinst.org/achievements

and does not disclose how it uses the money it gets.

Up to 2008, almost half of it went into paying their own salaries, IIRC.

The SIAI accounts are on Guidestar. You have to register, though.

In 2009, they received 432,139 of "gifts", made 194,686 by putting on a conference - and paid Yudkowsky 95,550 and Vassar 52,083. Yudkowsky probably also got a fair bit of the 83,934 spent on project 4c. 400,000 was also spent on the things described at the end of the document. Figures are all USD.

does not disclose how it uses the money it gets.

Just a minor correction: this cannot be a true statement to make of an American 501(c)3 charity because it would be illegal of them to not disclose what they're spending money on in their Form 990. Hence, it's easy to examine SIAI/MIRI, Girl Scouts, Edge Foundation, Lifeboat Foundation, JSTOR, ALCOR... Really, all the information is there for anyone who wants to know it, you can download for free, one just has to just not be lazy and not assume that it doesn't exist.