A real Web 2.0 application needs a serious mashup (https://web.archive.org/web/20120611110207/http://en.wikipedia.org/wiki/Mashup_?)(web_application_hybrid). At least the folks at ResearcherID thought so. You might remember (https://web.archive.org/web/20120611110207/http://network.nature.com/blogs/user/mfenner/2008/01/21/thomson-scientific-launches-researcherid-to-uniquely-identify-authors?) that ResearcherID creates a unique author ID for each interested scientist and was launched by Thomson Scientific (recently renamed to Thomson Reuters) earlier this year.
The new ResearcherID features include a mashup with Yahoo Maps that shows the location of your collaborators. Here are some examples from fellow Nature Networkers:
Wentworthville, Australia is the furthest I can go to find a paper coauthor.
Now the really interesting question would be: when do we see mashups with Nature Networkers? For a start we have the Nature Network London Flickr Mashup (https://web.archive.org/web/20120611110207/http://www.flickr.com/groups/nnl/pool/map?mode=group?) created by Matt.