Looking for a Generic lightweight job queueing (stack) implementation.

Hi,
I am looking for an easy to use job queueing system. Where a job is a
record in a table and several aggressive worker processes (from
multiple instances of a client application) each can take a single job
at a time. A job may only be collected only once.

The job queue will act like a stack and take care of the concurrency
issues. The job queue will have no prior knowledge of the consumers,
probably an event based (job firing) system may not be appropriate in
this case.

Allan.