A neat, flexible way to schedule a collection of effects to occur at given delays

I was helping someone out on #bukkitdev and came up with this solution to their problem. It offers a way to schedule effects to occur in a given order after a certain amount of delay and at a location of your choice.
I figured I'd post it here since it served a great learning experience for someone else and shows how to use a few things I don't usually see in plugins.

And here it is:
http://pastie.org/4068840

p.s. I never ran this through an IDE or compiled it so if I missed a colon or parenthesis then you'll just have to make do!

Posting this little update here so I don't forget about it. Shinyclef left IRC before I could show him.

http://pastie.org/4069131

This adds the ability to play and effect OR spawn a creature with minimal code changes.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.