it is trivial to think transplanting Web2.0 into the enterprise makes it Enterprise 2.0

the 2nd generation is about 3Cs
C reation : generation of tagged information, rich media, identifiable and locatable
Collaboration : rating,people building onto existing information, technology enabling people to interact
and C onnections : connecting with data, between businesses, consumers, peripherals and intermediaries

similarly,mashups is the blending & joining together of data from disparate systems (e.g. overlaying with a map source or weather system)
in the enterprise, the equivalent (i.e. Enterprise Mashups) may be corporate systems, customer databases, GIS, CRM, HR ...