One of the big things missing for Roll20 has been character sheets; they're now in testing for Mentors, and should see release in about a month or so. This is important of course, because until now it's been nearly impossible to maintain any sort of consistent data-structure for characters (since much of it had to be manually added, or duplicated from an existing charater, meaning mistakes were carried over and so on).

Not only does this mean my players no longer have to have David Esparza-Guerrero's (otherwise fantastic, and must-have) The One Ring Character Generator open while we play, it also means that I have full access to the characters, and as a result I can write better macros and API scripts in support of the rules.

For the curious, my sheet implementation, which as of this writing is a pull request for the official repo, is available to other Mentors who want to play around with it.