[Comment on Sam Ruby post RDF Tax, his comments choked]
I guess finishing the XSLT just landed back on my plate... @en
If the domain of your data is already covered by Atom, then pretty soon you won't even need to worry about the XSLT - just publish Atom and let GRDDL look after the conversion for the consumer on the fly (using the namespace as a key and treating Atom as a Custom RDF format).
Now that you mention it, I may have some questions in the near future going the other way, getting Atom out of RDF systems (i.e. for a ConverterFromRdf)...