I have been looking into this as well, as I have a MacBook Pro. Last time I flew I had the older PowerBook G4. The new laptops have the MagSafe port - and no-one that I can find does an adaptor for this to an Empower port. Apple has a Patent-Pending on the MagSafe, so probably aren't sharing the design [:(]. The best I could find is the Kensington power inverter
here. This is a converter, so you need to plug your normal power pack with the magsafe into this. The Kensington device however is US only, so will have a US plug socket on it, which means you need the US plug for your Apple power pack. I have this anyway, as I work in the US, but others may need to buy it. There are also conflicting reports as to whether it actually works with the MacBook Pro. I am sure there are similar power inverters from people other than Kensington.
I doubt that VS have the power tips for MBP. Incidentally, if you are in a PE seat that has the Empower socket, apparently they should offer you the tips.