The collection of PowerPoint presentations from Queen's University (http://meds.queensu.ca/medicine/deptmed/hemonc/ugrad.htm) is a good place to start learning haematology because they're intended for undergraduates.
Heme Team (www.hemeteam.com/cdrom_topics.cfm) tells you what you should know on each topic and gives short, useful information followed by multiple choice questions. The site covers most of the topics of importance to undergraduates for free, but some interesting themes are available only for sale.
The haematology and oncology section of the Merck Manuals (www.merck.com/mmpe/sec11.html) gives information on the clinical topics of haematology and an overview of cancer and treatment in general. The description of various diseases, with aetiopathogenesis, signs and symptoms, diagnosis, and treatment, is easy to follow.
The haematology and oncology chapter of the Family Practice Notebook (www.fpnotebook.com/HEM.htm) includes notes on clinical topics, with still more subheadings, such as epidemiology, differential diagnosis, and course of the disease, which makes it a better read for practical purposes and