- Hogan.js from Twitter
- Google Closure Templates
Google only has the homepage indexed
Google cache only has HTML structure and no content
I think that client side templating is really only ideal for a rich single page application. Otherwise, I think the SEO considerations are more important than the benefits you get from js templating.
This blog post does a good job of covering SEO for single page apps.
JS Template Chooser
SEO And Accessibility With HTML5 PushState
HTML’s New Template Tag
Model-driven Views – write dynamic HTML using HTML