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I just ran into what is a race condition in Drupal.  When there is a lot of database operations, Drupal does not have a locking/long lived transaction system in place and it can really cripple a site, along with presenting a biziilion errors to a bewildered developer.
The issue is explained here:  http://drupal.org/node/352978
I really like the power of drupal.  Too bad they don't have something like hibernate (a java-based object relational library) for drupal, I think that would be pretty easy problem to solve.