I created a changelist by doing...
$ svn changelist my_changes
... added files to it, and then committed the changelist...
$ sv
For those that are wondering, you can do this with a single command with svn. Simply navigate to the to level directory of files under your change list exist and run:
svn changelist --remove --recursive .
This will loop over all files under the current directory and attempt to disassociate them from the change list.