Some Jargons

it helps knowing few technology jargon
SOA - service oriented architecture
More a architecture design paradigm. A concept, a high level design not much technology focus. But at end of day is has be realized in technology!. There are tons of tools depend on purpose
EDA - event driven architecture
EDA is SOA with event intelligence . Basic technologies which are event aware - JMS, MQ. Pull model Http.
BPM- business process management
Tools - State engines, human workflow engines.
ESB - Enterprise service bus
Tools - Tibco BusinessWorks, ALSB (now OSB) etc. TIBCO BW, Oracle BPEL engine

Note: Like any new concept, SOA has it share of debates. Sometimes I even don't follow questions!. But I know with my experience, depending on use case, what fit where, which concept brings value and are reasonably better.