The numeric keypad comes in handy here.
5 - Switches between orthos and perspective mode.
1,3,7 - Select top, side, front
CTRL + 1,3,5 - Select bottom, (other)side, rear.
0 - Shows the camera view
If you switch to the scripts window one of the menu options will pull up a hotkey list (in version 2.34). I personally like to split the workspace into four areas:
<font class="small">Code:</font><hr /><span>
. . 2 .
. 1 .....
. . 3 .
. 4 .
Area 1 - Main 3D window
Area 2 - As needed (Secondary 3D, Scripts, etc.)
Area 3 - Camera View
Area 4 - Buttons
And don't forget that even the non-3D areas can be moved and scaled as desired.