From The World according to Vissie
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Keyboard short-cuts
Shift d Duplicate
Shift a Add
Shift s Snap to centre
Righ click select
b select
x Delete
a select all
r,x,90 rotale 90 degrees
tab object mode
s 100 scale
ctr-R make round corners straight
g,z, 100 move on axes
More to come at some point
... ...

If your objects middle is not in the middle. Try:

Press Shift + Ctrl + Alt + C (perhaps the longest shortcut in Blender) and select Origin to Geometry. Or, instead, open the Toolshelf by pressing T and press the Set Origin button in the Tools tab, subsection Edit.

Depending on how you imagine the 'Center' of your object, you might instead want to choose Origin to Center of Mass. The difference is that it calculates the center point based on the volume of the mesh, rather than the average location of vertices as Origin to Geometry does.