Your students are creating fantastic projects to show what they know. You can take their learning, and your ability to assess their achievement, to an even higher level using digital portfolios. Portfolios have long been a mainstay in the visual arts, where skill and expertise cannot be accurately represented by percentage points and letter grades.
Kidblog is a great resource for writing. Students are able to write in a safe environment. Teachers are able to see the progress the student is making, and peers are able to comment and review.
Having a copy of digital learning standards that presents them in a way that is easy to understand as well as broken down into understandable chunks will help as we work through digital portfolios and their relevance in a 21st century classroom.