Google Doc Useful Keyboard Shortcuts Pt.1

Paragraph Formatting
(Source: http://support.google.com/docs/bin/answer.py?hl=en&answer=179738)

Normal paragraph  Ctrl+Alt+0

Header style 1        Ctrl+Alt+1
Header style 2        Ctrl+Alt+2
Header style 3        Ctrl+Alt+3
Header style 4        Ctrl+Alt+4
Header style 5        Ctrl+Alt+5
Header style 6        Ctrl+Alt+6

Left alignment        Ctrl+Shift+L
Center alignment Ctrl+Shift+E
Right alignment   Ctrl+Shift+R
Full justify        Ctrl+Shift+J

Numbered list        Ctrl+Shift+7
Bulleted list             Ctrl+Shift+8