Just to add Avidyne's European equivalent of XM is first rate having seen the system in action and is available at a good avionics shop near you now. I gather Garmin for G1000 users are likely to announce a similiar product shortly.
Flying also reviewed a new form of Stormscope this month which simulates weather radar in a way not previously seen and is of course not reliant on a data link so will work any where. It looks to be a good product.