Here are some of my favourite sites to share with students interested in writing skills:
- OWL at Purdue: http://owl.english.purdue.edu/ good for citation guidelines and academic writing
- Harvard Writing Center: http://www.fas.harvard.edu/~wricntr/resources.html excellent for how to tackle an assignment
- University of North Carolina-Chapel Hill Writing Center handouts: http://www.unc.edu/depts/wcweb/handouts/index.html writing skills handouts are good, especially the one on developing a thesis statement
- University of Victoria Learning Skills Program: http://www.coun.uvic.ca/learn/index.html very good for general study skills, time management, getting ideas flowing etc.