As you all may know over the first week or so of the launch player are able to switch between servers for free and as many time as they want in a day.
With the WvW one team always seems to be dominating at one point but it may not always be the server you are on. What i have been doing is to switch between servers where the dominating force is and getting loads of XP and Karma for doing it. The best thing is, if they start losing you can just switch back.
What i have found, on my battle group at least, is that one server tends to just destroy the whole map at night and one in the day, so once you know this info you can get on the servers at the right times.
I know this inst very long but i thought i would just post it up here while we all still have the chance.
Not sure if it is just variable just to my server but have a look at yours and try and make some use of it.