TechBlog has done an interesting test, putting a Super-AMOLED vs a 'regular' AMOLED and an LCD in direct sunlight. They used 3 phones for the comparison: Samsung Galaxy S (4" 480x800 super-AMOLED ), HTC Desire (3.7" 480x800 AMOLED) and a Sony Ericsson Xperia X10 (4" 480x854 TFT LCD).

Super-AMOLED vs AMOLED vs LCD in sunlight photo

It seems that the best display is still the LCD, but the Super-AMOLED (which is a lot better than the regular AMOLED) comes close - and most of the times the difference is negligible.

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Cambridge Isotope Laboratories - Deutreated Reagents and High-Purity Gases for OLEDsCambridge Isotope Laboratories - Deutreated Reagents and High-Purity Gases for OLEDs