I ran across an app called "Spotting Session" the other day and it looks really interesting for taking time coded notes during screenings. It says that the company is an official development partner with Avid, so that's a huge plus right off the bat. If anybody has used it or knows more about it, let me know.
Here's the website.
ps. I have no official affiliation with either Spotting Session or Avid, so this is not a spam post.