For those of you who need to fix only one thing about their videos and feel that Video Improve is still too complicated, here's yet another one of our tiny tools coming soon:
http://store.steampowered.com/app/849010/liquivid_Video_Deflickering/
Check our developer page to see all the others we have available (for defishing, stabilization, effects, video merging, etc.).
Also, unlike VI, they don't do photos, batch processing or other fancy stuff. Only what the app name says :)