This is the Guide I use every day. Tan Geoff also has a smaller one which was written by Ven Ajahn Lee I believe but I haven't been able to locate it online (I luckily have my own beat up copy at home).
To avoid all evil, to cultivate good, and to cleanse one's mind — this is the teaching of the Buddhas.
Uposatha Observance Club:
My Practice Blog: