What determines the power levels of the different Daedric Princes? Is it the amount of followers?

I've heard a lot of people say that all the Daedra are equal, but I seem to remember that Jyggalag got cursed to become Sheogorath, because the other Daedra were jealous / fearful of his power?

It really depends on what sort of power you're talking about. Power over Tamriel is determined mostly by the number and quality of your followers, since you need followers if you want to operate in the mundus. Power in Oblivion is probably determined by how influential you are. The princes are all in complete control of their domains. It is only through wit, manipulation, trickery, or influence that you could adversely affect a prince. Think of how Lorkhan harmed the other et'Ada - by tricking (or convincing) them to put into motion a plan that killed themselves. That's the way you harm great spirits - by getting them to harm themselves.

The other deadric princes weren't jelous of jyggalag, he was just being a total A- hole and invading the other realms.

Think of it like this. Take, for example, God.

Now make 17 of him.

There you go.

18? Who is the extra? Unless you think Sheogorath AND the CoC have become separate DP's...

I said 17. You can't prove I didn't. :whistling:

Albinodunmer, thats why you need to quote people.

How close was Umbra to becoming a Daedric Prince, seperate from CV? Any chance that could have happened via the other Princes?

Sorry its morning and I'm tired.