This is an explanation of a solution to a specific problem with one of my plugins, but the issue is larger and should be understood by all WordPress plugin developers. Posting the write-up here with the hope it will be useful.
The issue is a change in the activity happening in the save_post hook. Id probably consider this change in WP to be a bug or regression - but its out there now in 2.6.x, so as plugin developers we have to work around it (even it a better solution is found in a future WP r....
