A $1300 Macbook costs £1,000 here in the UK which is roughly 30% more expensive than a direct currency conversion would have you expect. If you take that $1300 Macbook, add 30% and convert that to Euros it just happens to be that it works out at about €1300 which is what they charge in Germany. Someone posted about that here earlier.
Most of that 30% is due to VAT at around 20% for much of Europe, plus another 10%. It's that last 10% that's the real price difference of the goods.
Personally, I think the main cause of that is the generally higher cost of doing business in Europe (UK included). Everything costs more here. Petrol (Gas) and hence transport, wages, property, corporate tax rates, etc. It's hard, if possible at all, to find anything that's cheaper over here and all of that feeds in to the cost of doing business. The first time I visited the US I was shocked at just how much cheaper _everything_ seemed to be. Frankly, I'm surprised it's only another 10%.