Highly Recommended book on Writing: Style: Toward Clarity and Grace, Joseph M. Williams (new edition is out, but there are many used copies of this edition available online–click image for Amazon site.)
The UVA Writing Center is a writing resource staffed by graduate student tutors and available to all UVA students. Tutors work one on one with students in 50-minute appointments. We can help with drafting, revision, argument structure, and other special concerns. Several of our tutors are trained specifically for ESL. Though we can offer help at every stage of the writing process, we do not offer proofreading or editing services.
Oxford English Dictionary (will require proxy log-in off campus)
Turabian/Chicago Citation Guide (UW-Madison)
New York Times proofreading tips and examples