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The svnmerge script is a wonderful little tool. In a nutshell, you can take any branch and 'svnmerge init' it against any other branch (or the trunk by default) and then by typing 'svnmerge avail' obtain a list of changesets that are available to merge over from that branch/trunk to your working copy. 'svnmerge merge -rN will merge a particular version over and let you commit it to the branch. Once committed, the svnmerge avail command will no longer list that changeset as available to merge over. This can work either in either a star pattern where each branch can merge changes over from the trunk selectively, or in a chained pattern where branches follow a release process of development->staging->production. In the chained approach checking the available patchs will only give you the changeset available from the source branch allowing for a clean structured code tagging/release process.

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