Just a couple recent IRS rulings involving Subpart F and PFIC elections.
PLR 201201016 – Majority of proceeds from sale of Controlled Foreign Corporation’s banking assets not foreign personal holding company or subpart F income. http://www.irs.gov/pub/irs-wd/1201016.pdf
PLR 201152007 – Extension for late PFIC QEF election granted. http://www.irs.gov/pub/irs-wd/1152007.pdf