Email templates in sForce 5.0

Hi guys!

I wonder if there any objects/methods in sForce 5.0 that allow me to handle email templates? For example, I need to send email notification to account owner when probability of primary opportunity for his account exceeds 75% OR I need to send email notification to previous account owner when account owner is changed. In sForce 4.0 I handle such a task via sophisticated mechanism with help of Attachment, Campaign, Email template and Workflow rule and alert handling all of this via API.

I hope there are some features in new release, that let to handle this process simplier - am I right? If so, could you please give me a start of where to investigate.

Any advices/comments/links appreciated