For those who are interested in such things there was a review article by Stephen Reynolds and friends on magnetic fields in SNRs and PWNs that will be appearing in Space Science Reviews. It was posted on astro-ph today:
http://arxiv.org/abs/1104.4047
Those not in the know may be wondering why we care about magnetic fields in these type of objects. Well knowing the magnetic field in supernova remnants (SNR) and pulsar wind nebulae (PWN) gives us handles on the effects of the magnetic field on the hydrodynamics of these objects and it gives us constraints on how particle acceleration is occuring. After all these objects boost particles up to 10-100's of TeV, and the magnetic field is thought to be the mediator of this acceleration. Thus understanding the field is fundamental in order to understand the impact of these objects.
Also there is a picture from a paper by our own Heather Matheson in the article. See if you can find it. Anyways thought people might be interested in reading such a review.