Excuuuuuse me princesses, but these people have little to do with the PSN hack, which by the way hasn't been proved to find it's guilty part in Anonymous.
These people were attacking websites of the Spanish goverment after several quite unjustified actions done by said goverment, who are a bunch of corrupt assholes that kneel before banks and markets and sell our rights to the market economy. That said, these people also attacked several websites of the goverments involved in the repression of the Arab Spring revolts. So yes, they have my support, I hope they get released.
The situation in Spain is pretty bad at the moment, corruption is at it's tops and nothing is being done to solve it, Anonymous is one of the groups who is trying to give these assholes on the top a lesson. Why anyone should be happy about this arrest is a mistery to me.