I found it very helpful and putting in my blog to help others, If you find any other combination that is missing in this list, Do update in comment section and I`ll include them into the list
All shortcuts beginning with CTRL+W are   for opening or navigating to Windows:
- CTRL+W, S: Solution Explorer
 - CTRL+W, E: Error list
 - CTRL+W, R: Resourceview
 - CTRL+W, A: Command window
 - CTRL+W, T: Taskview
 - CTRL+W, Q: Find Symbol Results
 - CTRL+W, X: ToolboX
 - CTRL+W, C: Classview
 
Thanks 
Pradeep