For those hoping to watch this anime online, you will need to know the three names it is often found under.
Japanese Name: Kaibutsu Oujo
Princess Resurrection (what this site has it listed as)
one or perhaps both of these two above names is the accepted english name for the anime. I first came across it as "Monster Princess" but of late have had far more luck finding it as the later.
The reasons it may be important to note all three of these names are:
1.) In the above list you will see it called all three of these if you pay attention, so hopefully this will clear up any confusion.
2.) Rarely will someone list all three of these names. There seems to be some loyality to one name or another from person to person.
3.) Perhaps I am unlucky, but I have had quite a time finding this series in completion. Knowing all three names may help you close the gap between a few episodes as they break or are removed.