I?d like a customer to be able to use an online program to create
slides (based on templates, and upload pics) that will allow them to
create a power point type presentation in flash, they would then need
to include the audio part of it either by phone (and it would attach
to the presentation) or by a mic on their computer.

Do you know of any script that will allow me to do that? Or if I have
to hire a programmer what should I look for and what would something
like this be called?

http://powerbullet.com/ is a free downloadable program that will do this.