Paint program for curved, anti-aliased lines?

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http://ubuntuforums.org – Not really sure where to put this thread... I need to find a simple paint program that can draw a long, anti-aliased line with many curves in it. I've tried KolourPaint, which is the perfect level of simplicity, but it has neither the spline curve tool to make the line, nor anti-aliasing. XPaint does the line quite well, and even does arrow heads, which is a nice bonus, but doesn't have anti-aliasing. Gimp of course is capable of spline curves and anti-aliasing, but is far from simple. I did try it for this, but soon got frustrated, and I just don't have the free time to learn to use it. Ca (Hardware)