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Which .NET version? Which SL version?
Currently the SLF core is built for .NET 3.5, however the only .NET3.5 feature used in the ToList() extension within CompositeLogger. Perhaps SLF core should be built for .NET 2.0.
Also, SLF.Silverlight is built for SL 3.0, perhaps SL 2.0 would be a better choice?