SVN Tree Definitions

trunk

The latest and greatest, the trunk should always be kept in a runnable state

branches

Main work branches, this includes the testing branch which is where code resides before being merged into the trunk

sandbox

Sandboxes for trying things out and single "feature branches", usually branched from branches/testing -> sandbox to simplify merges back into the main testing branch.

tags

version tags, read only, never commit on a tag

binary

repository for maintaining build scripts, binaries, etc for binary version deployment.