A small correction to the things mentioned above. All European countries now conform to the 230V standard. However most people tend to forget, and still refers to it as 220V.
If you have equipment that can be set for 220, then they will not have any issues with 230V - same thing applies if you have a 240V setting (UK was the only country on 240V)
As in the US, voltage will be going up and down, so you can expect anything from 200 to 240V.
Many countries do not have legal requirements on ground installations except in citchens, so outlets with two plugs are the most common installation, even though new EU requirements does state all new installations should be done with a third ground wire.
A step down transformer can be used for 90% of your gear, including household, but you should remember that there is powerloss in all transformers, and power is generally a lot more expensive over here, so it may not be worth while to do it in the long run.
Finally, as mentioned there is the regional coding on DVD's, so check if you can hack your dvd before bringing it. Region 1 dvd's are pretty easy to purchase in most countries so there should be no worries for bringing it back home.
Hope this helps and got luck on the assignment..
