difference between Esb and aqualogic service bus

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Oracle Service Bus (OSB) is the new name for AquaLogic Service Bus (ALSB). Oracle Enterprise Service Bus (ESB) is the 'old' Oracle product.
ESB is currently better integrated with BPEL due to fast path connections between the two (don't use web services if they don't need to) and also uses the same adapter framework.
OSB is more functional than ESB, providing better monitoring and dashboard capabilities. It also allows richer message routing, throttling and message enrichment.
OSB in the next release will have support for the Oracle adapter framework (JCA based). This will give OSB access to the same range of adapter as BPEL and ESB, in addition to its existing adapter set. This will give OSB greater connectivity than BPEL or ESB as the current OSB has better Java and JMS connectivity than the existing Oracle SOA adapters. Certification of individual adapters with OSB may take a while. This release should also have fastpath connectivity support between BPEL and OSB.
In the 11g timeframe expect to see a merging of functions from ESB 11g into OSB, particularly to support the SCA framework.
Hope this clarifies things.
Note the above are based on my understanding and should not be construed as an official Oracle position statement