Understanding FMRI
In order to design a good experiment, you will need a working understanding of the nature of the FMRI signal.
MRI tutor by Ray Ballinger. There is a link there to a standalone windows tutor on MRI artefacts.
MRI artefact gallery with pictures of common MRI artefacts
FMRIB physics page with some excellent powerpoint presentations on FMRI theory
Introduction to the physiology behind the FMRI BOLD response by Irene Tracy at FMRIB