You can maximize a window in Windows 7 using the Win+↑ keystroke. You can also maximize the window along the vertical by double-clicking the upper or lower bits of the window chrome of a "normal" window. But is there a keystroke to achieve the vertical maximize?
Win + Shift + Up
The whole list of Windows keyboard shortcuts.
The official and complete list of Windows shortcuts can be found on the Microsoft support page. Alas, for what it excels at in information, it lacks in SEO.
So yeah, Win + Shift + ↑, but possibly so much more!