P2P for e-business - applications?

["Stephen Green" <stephengreenubl@gmail.com>]

I've been interested, partly just pure curiosity, in
how P2P might be used for e-business, such as
between small and medium sized businesses
and such as using OASIS and other open
standards.

I noticed an article on the subject
http://igitur-archive.library.uu.nl/math/2006-0727-200353/Xu_05_NASM05_camera_ready.pdf
so I gather there has been interest in it for some time
by various groups.

What I'd like to ask is: Has anyone come across
applications (opensource especially or services like
a B2B version of Napster) geared toward P2P for B2B?
I wondered if such things are being used widely by
any small businesses; also, which of the various well
known apps (such as for ebXML) might be useful in
such a scenario, within the means of a particularly
small business say?

I'm also interested in whether human interfaces for
such scenarios might use browser and, say, XForms
or the like or whether the requirements of P2P demand
more sophistication - unless one has Google's human
resources, say :-)

Many thanks

Stephen Green