Blizzard has renewed their agreement with a company called TeliaSonera to provide bandwidth for them in Europe. They just made a very similar deal with AT&T for the US -- it's the bandwidth that connects their servers to the millions of connections that lead back to your computer as you play World of Warcraft. Paul Sams, Blizzard COO, says they've been pleased with the service, and that the contract renewal was for two years.
It's interesting that we've seen Blizzard keep both of these agreements intact, but we already know that they'll cancel relationships they don't see as working (with the notable example of Netease's takeover in China). Of course, there are tons of factors that go into players' connections (including this server connection as well as your own ISP, your router and computer, and a number of other facilities and stops in between), but it would seem that Blizzard is happy with the way things are going in both the EU and the US with these providers. Of course everyone's personal experiences are different, and we've certainly seen our share of connection issues, but in general, the infrastructure on the networks is in a pretty good place.