Some brief notes from a Mac OS X perspective:
http://www.wuala.com/grahamperrin/public/2009/04/11/evernote-fsc-001.png for an fseventer view of file system changes when Evernote Web Clipper in Safari produces a PDF, launches the main and helper applications, and syncs.
No evidence there of Sync Services, which may be surprising given the otherwise fine use of available technologies.
statistical natural language processing,
document classification, clustering, topic modeling, information extraction,
and other machine learning applications to text
"Although the Semantic Web (SW) is still very much in its infancy, there is already a lot of data out there which conforms to the proposed SW standards (e.g. RDF and OWL). Small vertical vocabularies and ontologies have emerged, and the community of people using these is growing daily.... "