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been thinking about fixing tiled rendering for mightymandel too.  one strategy might be to render tiles with a slightly larger region (as edges get corrupted with slope encoding / fake-de), then crop them to the desired size.  if the tiles are NxN, you only need around k*N extra edge samples, where k is typically a lot smaller than N.  so it computes more iterations, but assembling later is a lot easier (no postprocessing of combined tiles needed).

btw, probably my monitor is not set up correctly, but I noticed some visible banding in the dark areas (I amplified a small region of the attached) - maybe dithering would help?  ie, compute the "perfect" supersampled colour for each pixel as an rgb floating point triple in [0..1], then add a small amount of noise (peak-to-peak amplitude 1/256 for 8bit final image) before rounding to rgb int8 triple in [0..255].  dithering reduces perceptual quantization error, like banding at low amplitude changes - the steps between bands add visually jarring high frequency content, dithering spreads out the error spectrum. same theory applies to digital audio. I'm sure wikipedia or some dsp site could explain it better than i can...  i'll start a new thread once i've researched it a bit more...