SSMS

Environment
Object Explorer F8
Properties Window F4
Registered Servers CTRL + ALT + G
Summary Window F7
Solution Explorer CTRL + ALT + L
Template Explorer CTRL + ALT + T
Toolbox CTRL + ALT + X
Running Code
Cancel query ALT+BREAK
Execute query CTRL + E
Estimated execution plan CTRL+L
Include actual execution plan    CTRL+M

Links
Change 'Edit top 200' rows setting in SQL 2008

Management Studio Speedup Tips
Remove Splash Screen 
Disable looking for managed code
Disable Error & Usage Reporting
Enable Shared Memory
Management Studio : Start Clean!
Clear Password List / Remembered Servers