Windows 7 resize shortcuts to Mac OS X
Solution 1:
It's not possible without 3rd party software.
Cinch is similar to Windows 7. SizeUp is its more powerful, more complicated and keyboard-oriented cousin.
An alternative is Arrange.
Solution 2:
Better Touch Tool provides Win 7 and much more functionality. It is donationware.
Keyboard Maestro also provides this functionality but is a much richer (that's secret code for "complicated") app.