I get my tutoring work from word of mouth, and the aplustutors website.
BBC Bitesize has excellent study materials for Higher and Standard Grade.
Go directly to the source for Scottish Qualifications Authority past papers and general information - Standard Grade and Higher English.
National Qualifications Online has many free resources for exams, including an excellent music section with mp3s for you to listen to.
Find out about web useability from Jakob Neilsen's useit site