Olympus have got two offers running at the moment for prospective E-M1 buyers and those who currently use Olympus' E-System cameras.
Olympus are currently giving you the chance to register to be eligible to get a free HLD-7 battery grip, that will enable you to get longer shooting times as well as a firm, natural grip for portrait shots.
Olympus are also offering a free MMF-3 adapter for those who are already a registered Olympus E-System user. This adapter will enable you to connect up your four thirds lenses.
For more information, terms and condititions and to get these two accessories, register on the Olympus website
For more information on the E-M1, take a look at ePHOTOzine's Hands-On Review