Although it does not appear to be one of the many resources available at the newly-launched Post-Reformation Digital Library, I have recently discovered that Matthew Poole's English Annotations (his English Commentary, as opposed to his Latin Synopsis Criticorum, which is being translated into English by the Matthew Poole Project) is available to read online at Google Books. The three-volume edition now available online was published in 1853.
Vol. 1 (Genesis-Job)
Vol. 2 (Psalms-Malachi)
Vol. 3 (Matthew-Revelation)
Note: Matthew Poole authored these annotations through Isaiah 58. His continuators are listed here.