C# code snippet - Making mouse cursor linear movement looks more realistic. Source: http://stackoverflow.com/a/913703/2019740

LinearSmoothMove.cs

[DllImport("user32.dll")]
private static extern bool SetCursorPos(int X, int Y);

[DllImport("user32.dll")]
public static extern bool GetCursorPos(out Point p);

public static void LinearSmoothMove(Point newPosition, int steps)
{
    Point start = new Point();
    GetCursorPos(out start);
    PointF iterPoint = start;

    // Find the slope of the line segment defined by start and newPosition
    PointF slope = new PointF(newPosition.X - start.X, newPosition.Y - start.Y);

    // Divide by the number of steps
    slope.X = slope.X / steps;
    slope.Y = slope.Y / steps;

    // Move the mouse to each iterative point.
    for (int i = 0; i < steps; i++)
    {
        iterPoint = new PointF(iterPoint.X + slope.X, iterPoint.Y + slope.Y);
        SetCursorPos(Point.Round(iterPoint).X, Point.Round(iterPoint).Y);
        Thread.Sleep(2);
    }

    // Move the mouse to the final destination.
    SetCursorPos(newPosition.X, newPosition.Y);
}