The best replacement for silverlight is wpf.

The best alternatives to silverlight are rated as following:
★★★★★  wpf
★★★★★  html5
★★★★  flash
★★★  flex
★★★  asp.net
★★★  moonlight
★★  mvc
★★  adobe
★★  ajax
★★  html5 netflix
★  adobe flash
★  jquery
★  flip4mac
★  xbap
★  lightswitch
★  xna
  asp.net mvc
  mvc 4
  adobe air
  wpf application
  adobe flash player
  asp
  javafx

Your alternative for silverlight is not listed? Suggest!
Speaking about silverlight, one probably shouldn't forget about netflix.

Other search terms related to silverlight and their ratings are:
★★★★★ netflix
★★★★ xaml
★★★ visual studio
★★ mvc
★★ mvvm
★ crm 2011
★ entity framework
★ ria services
★ sharepoint 2010
★ visual studio 2008
mvvm tutorial
You have in mind a companion for silverlight and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of silverlight in all years. Click on graph for more.
silverlight
wpf
html5