community owned wiki Answer - feel free to edit or add comments:
Keyboard Shortcuts
- F5, CTRL + E or ALT + X - execute currently selected TSQL code
- CTRL + R – show/hide Results Pane
- CTRL + N – Open New Query Window
- CTRL + L – Display query execution plan
Editing Shortcuts
- CTRL + K + C and CTRL + K + U - comment/uncomment selected block of code (suggested by Unsliced)
- CTRL + SHIFT + U and CTRL + SHIFT + L - changes selected text to UPPER/lower case
- SHIFT + ALT + Selecting text - select/cut/copy/paste a rectangular block of text
Addons
- Red Gate's SQL Prompt - IntelliSense (suggested by Galwegian)
- SQLinForm - formatting of TSQL (suggested by Galwegian)
- Poor Man's T-SQL Formatter - open-source formatting add-in
Other Tips
- Using comma prefix style (suggested by Cade Roux)
- Using keyboard accelerators (suggested by kcrumley)
Useful Links
- SQL Server Management Studio Keyboard Shortcuts (full list)