.eu stands for European Union, and it's an upcoming domain name extension. Here's a recent article on the rules governing this domain extension:

http://www.multireg.com/article445.html

Some important facts to note:

1. This extension CANNOT be pre-registered since it's not even approved yet.

2. This extension CANNOT be pre-registered since it's not even approved yet.

In other words, I've seen a lot of internet pre-registration scams out there - don't fall for them. We don't even know how much one of these domains will cost yet, so any estimates are pure guesswork.