According to Superherohype.com, after having won the People's Choice Award for "Favorite Female Action Star" Halle Berry was so pleased that fans like her "Storm" character so much that she told them if they really want X-Men 4 to be made, it's up to them.
Here's what she said:
"You guys really love X-Men? Ok, here's what you have to do. Write letters. Every one of you in this building who love X-Men and want to see X-Men 4, write a letter to Tom Rothman at Fox and tell him so and you will get another one, and I'll be there too."
Considering how fairly weak X-Men 3 was (yes, I gave it 3 out 5 stars, but I was in a generous mood that day) and the fact that generally speaking, each consecutive sequel in a series gets worse than the previous film, I won't be blasting any emails off any time soon clamoring for another movie. Maybe if they brought Bryan Singer back to helm it, but he's probably going to have his hands full with the Superman sequel.
I find it funny that Halle actually won the award considering how awful her performance was in X3. Of course considering the competition was Uma Thurman in My Super Ex-Girlfriend which was no doubt pretty awful and Kate Beckinsale in Underworld: Evolution which had a lot fewer people see it I guess I'm not surprised.
If you're actually interested, the contact info is at the SuperHeroHype.com link above.