I crosspost in about half a dozen places, depending on the fic. It's more of a pain that anything sometimes though, since each community has a different posting template. I finally made a draft post in Yahoo mail with all the comm templates and I just fill in the new info, then copy and paste.

As for inspiration, yeah, it happens too often! I could be writing the stories i have in my head for the next ten years, and then there's always new ones. [sigh]