For the Virtual Classrooms I have a couple of suggestions:
All the Virtual classroom offerings should be available in a calendar view so that you can see which are available by date and time that you have available as a quick and easy all in one view. This keeps you from having to drill into each one to see which dates and times are available for each.
Also it would be nice to have predefined tracks that you could sign up for and provide a checklist or progression chart or list that shows the progress in that track.
Finally it would really be nice to have a Troubleshooting series, the setup and operational courses are great, and you have a wonderful support group and who could argue that THWACK isn't a game changer... but this would really be great for those of us that are new to the admin side of SolarWinds!