Pondering some writing questions...

So, irysangel was talking about working on more than one project at once. And that got me to thinking...

How do folks work on more than one project at a time? Do you have problems switching from one world (or one form - ie, short story to novel, or novel to screenplay) to another? What tricks/tips do you have to help those of us with one-track minds to learn to be a bit more flexible?

The reason I ask is because I'm looking at upcoming deadlines. I'm on a self-imposed deadline to finish Dreams by April 15th (Lord help me). I need to get cracking on the edits for Seasons, because that needs to be done by April 30th. I have the first episode of Wings that has been woefully neglected, that I need to finish. I have SB that I need to get started on. And I need to start outlining Descent into Darkness and Last Rites.

And that's just the fiction stuff.

So yeah, I'm going to be a busy girl. But I've always had problems writing on more than one book at a time, even though all the advice I've heard is that professional writers always have at least three, if not four, projects going at any one time.

So if you have some tips, I'd love to hear them.