Open Access means research publications that are freely available in fulltext on the Internet.
Here you will find a number of short films (most often no longer than 1 minute) with researchers, librarians and publishers talk about what they see as advantages with Open Access and Open Access publishing.
Listen to Lars Juhl Jensen, Ph.D., Structural and Computational Biology Unit, EMBL-Heidelberg, Germany:
Listen to Melissa Hagemann, Program Manager at the Open Access Initiative, Open Society Institute: