Reviews in Fluorescence 2004, the first book of a new book series from Springer, is a collection of current trends and emerging hot topics in the field of Fluorescence. This annual review series differs from Springer's current Topics in Fluorescence series in that it is more specialized and includes reviews of an individual's own work or scientific perspective. Reviews in Fluorescence will therefore complement the other fluorescence titles published by Springer, whilst feeding the requirement from the fluorescence community for annual informative updates and developments. Key features: - Reviews in Fluorescence will be citable, indexed, and available both in print and online. - Reviews in Fluorescence will be published annually. - Reviews in Fluorescence will comprise invited review articles that summarize the yearly