Make sure your layer is pixel-aligned when setting it's position. (Avoids things looking blurry)

gistfile1.m

// when setting the position of a layer, use this: 
// layer.position = [ layer pixelAlignedPostionForPoint:<originalPoint> ] ;

@implementation CALayer (SetPositionPixelAligned)

-(CGPoint)pixelAlignedPositionForPoint:(CGPoint)p
{
	CGSize size = self.bounds.size ;
	CGPoint anchorPoint = self.anchorPoint ;
	
	CGPoint result = (CGPoint){ 
		roundf( p.x ) + anchorPoint.x * fmodf( size.width, 2.0f )
		, roundf( p.y ) + anchorPoint.y * fmodf( size.height,2.0f )
	} ;
	return result;
}

@end