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Do not develop code in your working copy for an extended period of time without committing it, provided that checking it in does not cause a compilation or test case failure.  This is especially true if there is the possibility that someone else is working on the same file.

If there are files generated by your project's build which should not be put into SVN, consider adding these file names to the ignore list for the project's directory, as covered here:

http://stackoverflow.com/questions/86049/how-do-i-ignore-files-in-subversion