I stumbled upon this copy of the Three Forms of Unity published just this year by the Reformed Church in the U.S. (RCUS). Not only is the translation very fine, it contains two really excellent resources as appendices; First, a summary of the Belgic Confession, breaking each article down into a series of theses accompanied by relevant scripture texts proving that thesis; Second, a summary of the Canons of Dort, describing the contents of each article and rejection in a single sentence so that one can get a nice birds-eye view of the entire document. While the price of the printed copy is hard to beat, you can also download a .pdf of the booklet for free here.
The second resource I stumbled upon was an eReference Library published also by the RCUS containing some excellent confessional resources in .pdf form, several of which are nearly impossible to find in print. For $49.00 (+ 10% shipping), you can get some 27 books, including:
Zacharias Ursinus, Commentary on the Heidelberg Catechism (1616, 1852)
Otto Thelemann, Aid to the Heidelberg Catechism (1896)
George W. Bethune, Expository Lectures on the Heidelberg Catechism (1864, 1866)
Henry Beets, The Belgic Confession Explained (1929)
Peter Y. De Jong, The Church’s Witness to the World: The Belgic Confession (1960)
Thomas Scott, The Synod of Dort and Its Articles (1818, 1841)
I’m strongly considering spending the money simply for the volumes by Bethune, De Jong and Beets! The others are just icing on the cake!
I’m a little confused about how the ordering process works (see the note at the top of this page), but this looks like a dynamite set of resources!