Of the four technological tools we learned about on Friday, I was most taken with the possibilities of using diigo. As I discovered from Ryan's excellent presentation, one of the most underrated tools on diigo involves caching websites that are likely to change. This seems promising when used in combination with diigo's ability to let one annotate the website with comments.
One popular and useful assignment English teachers give out involves asking students to annotate/take notes on/talk to the text on a specfic piece of fiction or non-fiction and then turn those annotations/notes/texttalks in. The teacher can then assess students' abilities to extract information, gather main ideas, make connections, identify unknown words, and ask relevant questions. I've only seen this done on paper, however.
With diigo, I think I could assign students online articles or fiction and ask them to take notes over the computer. Students could then share with me their annotations through diigo. This seems preferable to uploading and downloading 30 pdfs or adobes, and it also seems easier to navigate than a screenshot, especially if the text is more than one page. Particularly when it comes to preparing students to read at a college level, reading on the computer is an increasingly important skill and diigo potentially provides a tool for us as teachers to assess students' digital reading comprehension strategies.