UV Unwrap is flipped horizontally? Whenever I unwrap this plane, it seems to be unwrapped horizontally flipped.
It's a simple plane that is 'subdivided' because it's for a 3D pixel art experiment. Is there anyway to 'flip' the UV? (I know I can just flip the texture in photoshop, but there is something inherently wrong with backwards textures.)
Here's a screen capture to show what I mean.
Cegaton's comment provides the right answer but leaves out a crucial detail. First, make sure all of the vertices whose assigned textures you want to flip are selected, then switch to the UV editor window, and press the key sequence S - X - 1 - - [hyphen]. 

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