There are many sites online for recording and posting materials. These are two that I would recommend; both are free:
I would recommend using Audioboo. Students do not have to create accounts to use Audioboo and can post the link on an assignment page in blackboard.
The first is called Voxopop and is similar to VoiceThread. It allows for “Talk Groups” where members can each post recordings. Here is a fun example.
Full directions and information on these tools and using YouTube for student videos are available here: tech_for_listening_speaking