Depending on what you do, and your display setup, there’s a chance you work with two windows open at the same time. You might want a Finder window and an FTP client side by side. Or perhaps be coding two documents at the same time (sometimes tabs just don’t cut it), while having a browser window open on the second display. Whatever be the case, if you find this happening more than once a day, TwoUp or SizeUp might come in handy.
TwoUp lets you quickly position any window occupying half the screen sideways or split from the top. Simply hit Cmd+Option+Ctrl and hit any arrow to align it so. It’s much like what Windows 7 has got going with the sticky drag windows, except this time it’s with keyboard shortcuts. While 2Up is free, it doesn’t play nicely with multiple monitors nor does it have an extensive list of sizing options.
SizeUp (which comes at price of your choosing) will continue from where TwoUp left off. I didn’t have the liberty to test this one out (perhaps Milind can help us out with his dual monitor setup?).

SizeUp allows you to quickly position a window to fill exactly half the screen (splitscreen), a quarter of the screen (quadrant), full screen, or centered via the menu bar or configurable system-wide shortcuts (hotkeys). Similar to “tiled windows” functionality available on other operating systems.
Additional features include moving windows from one monitor to another and restoring a window to its original size and position (SnapBack).
And while I’m talking about there two apps, Irradiated Software also has a third ‘experimental’ app FinderMiner. It allows you to permanently set the size and location of new Finder windows. Works as advertised.
Personally speaking I’ll just keep FinderMiner on my MacBook, since I don’t have much use for the other two. I do hope someone finds it useful though.













