The current issue of the Oregon Law Review, vol. 85, 2007, has an article (Comment) by Sarah Burgundy on Measure 37, “Charming the Eight-Hundred-Pound Gorilla: How Reconsideration of Home Rule in Oregon Can Help Metro Tame Measure 37.”
And, oh joyful day, the Oregon Law Review makes their articles available online to the public. This article is here.