I know I need to register my script somewhere - where do I do that?

Registering for what? Script Frenzy, professional production, what? What are your plans for your script?

I remember seeing something on here last year after April was done about registering our scripts so they can't be stolen. I don't think it was copywriting, but something along those lines. Writers Guild? Does that make sense, or am I totally off base?

I want to start shopping my play script once I get the last rewrites done, but I don't want to do that until it's protected somehow.

I believe the Writer's Guild of America registers screenplays and teleplays. You can copyright your stage play. Try the US Copyright office (if in the US. if outside see what your country does.) As I understand it, writers sell the copyrights to the studios when a screen play or teleplay is sold but stage plays the copyright stays with the playwrite.

In any case I'd register it after the rewrites.=)

Thanks!

Ok, I was just researching this for another project so it's fresh.

You can either register it with the Writer's Guild of America (or I suppose if you aren't an american then with some other writer's guild...) or you can get a copywrite.

Both require that you re-register if you make significant changes to the work. But it's worth it if you are serious about trying to do something with it.

The Writer's Guild is cheaper but it doesn't work the same as a copywrite. You don't get the same protection. This is from their site explaining why one should register with them:

The registration process places preventative measures against plagiarism or unauthorized use of an author's material. While someone else may have the same storyline or idea in his or her material, your evidence lies in your presentation of your work. Registering your work does not disallow others from having a similar storyline or theme. Rather, registering your work would potentially discourage others from using your work without your permission.

Though the Registry cannot prevent plagiarism, it can produce the registered material as well as confirm the date of registration. Registering your work creates legal evidence for the material that establishes a date for the material's existence. The WGAW Registry, as a neutral third party, can testify for that evidence.

The YWP of SF has it's "You wrote a script-now what" page already up. It mentions Writer's Guild for registering...