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The emergence of non-gaussian distributions for macroscopic quantities innonequilibrium steady states is discussed with emphasis on the effectivecriticality and on the ensuing universality of distribution functions. Thefollowing problems are treated in more detail: nonequilibrium interfacefluctuations (the problem of upper critical dimension of theKardar-Parisi-Zhang equation), roughness of signals displaying Gaussian 1/fpower spectra (the relationship to extreme-value statistics), effects ofboundary conditions (randomness of the digits of pi).Comment: Invited contribution at SPIE conference on Fluctuations and Noise,  Santa Fe, 2003; 9 pages, 6 figure

Scaling functions for nonequilibrium fluctuations: a picture gallery