Voice Acting
Check this out when you really want to give those little minifigs a voice.
Articles
Creating an Effective Casting Call - Quality voice acting is a crucial component of most brickfilms. Make sure you attract the best talent by creating an effective casting call.
Recording Good Lines - This will help you record good lines for your films, and won't let others down in auditioning for theirs.
Links and Resources
Voice Acting Help (link) - A very helpful article that tells not only how to voice-act, but also what programs you need and how to use them.