How can i find out about job openings on either of the next two Harry
Potter movies, or make an indipendant application for a job on the
movies?

I really hope to hear back, fingers crossed!

Dear djkrella, 

First of all, I don't want to discourage you, but you'd have to face
the fact that  even if the crew is not already set, there are probably
many applications for this type of job and your chances are not very
good.

Harry Potter's production is handled through Hayday Films: 

Hayday Films
5 Denmark Street
London
WC2H 8LP 

Tel:  	(020) 7836 6333
Fax:  	(020) 7836 6444


Time Warner also have a site where you can apply. They don't have any
vacancies in their costume department listed there, but let you post
your CV:

http://www.wbjobs.com/index.html?frompage=wb_homepage 

I hope this answers your questions. Please contact me if you need any
clarification on this answer before you rate this answer.

What skills do you have? What trade union memberships do you hold?

I'm a technical fashion designer by profession. So I'm looking to be
involves in the costume department.