One of the five key science projects for the Square Kilometre Array
(SKA) is "The Origin and Evolution of Cosmic Magnetism", in which radio
polarimetry will be used to reveal what cosmic magnets look like and what
role they have played in the evolving Universe. Many of the SKA prototypes
now being built are also targeting magnetic fields and polarimetry as key
science areas. In this talk, I will review the prospects for innovative
new polarimetry and Faraday rotation experiments with forthcoming
facilities such as ASKAP, LOFAR, ATA, EVLA, and ultimately the SKA.
Sensitive wide-field polarisation surveys with these telescopes will
provide a dramatic new view of magnetic fields in the Milky Way, in
nearby galaxies and clusters, and in the high-redshift Universe.