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Cutting back leaves in fall or early spring can help prevent iris borer problems as well as making your iris clumps look tidier. See this DG article: http://davesgarden.com/guides/articles/view/832/
Nonblooming iris clumps may be too crowded and need dividing and replanting. If they're not getting enough sun, then moving them to a sunnier spot could also help blooming.
For more info -- and some great photos, etc. -- head over to the Iris Forum!