Peter Smith’s Logic Matters blog — logic, philosophy of maths, music, other enthusiasms and occasional rants. Latest posts: "Teach yourself logic, #2: modal logic" on 20 May; "Book note: Smullyan's Theory of Formal Systems" on 15 May; "Teach yourself logic, #1: Basic first-order logic" on 06 May.
Web pages to support An Introduction to Formal Logic (CUP, 2003: reprinted with many corrections 2009). Links to answers to exercises. But also various additional materials, overheads for lectures, worksheets, unpublished chapters.
Web pages to support An Introduction to Gödel’s Theorems (CUP 2007: later reprinted with many corrections). Additional materials include lecture notes ‘Gödel Without (Too Many) Tears’ for philosophers, and two very short courses for mathematicians.
The LaTeX for Logicians pages, which give a brief guide to resources of interest to logicians, philosophers and others using LaTeX to produce papers or presentations, teaching materials, theses or books, and perhaps wanting to include logical matter such as natural deduction proofs.
Yet More Logic. This page links to various notes, handouts, draft papers, book reviews and so on from the last few years, of rather varying levels of sophistication and difficulty (but all should be accessible to graduate students in philosophy with a bit of logic).
For students [under development]. All that is here at the moment is some advice intended for graduate students from an ex-editor, about writing first papers for publication. And some general advice on writing-style. But more is planned …