Sorry, that's a lame title. "Means business", I mean (sic). Anyway, exciting reports of their plans for using various forms of structured content that are out there, inluding key microformats, eRDF and RDFa, Dublin Core(!). There'll be a developer platform, too, and the ability to "create mods for Yahoo search that leverage their semantic data". This sounds more than Google Base or something, this is very cool and I wonder if it might mean that using custom POSH will also work.
 see this too