Recursively delete CVS directories:
find . -depth -name 'CVS' -exec rm -rf '{}' \; -print
Remove .svn directories from a git repository:
find . -depth -name '.svn' -exec git rm --cached -r '{}' \; -print
Remove .pyc files:
find . -depth -name '*.pyc' -exec rm '{}' \; -print
Remove custom OS X iconts:
find . -depth -name 'Icon[^\w\W{1}]' -exec rm -rf '{}' \; -print
Remove .DS_Store files:
find . -depth -name '.DS_Store' -exec rm -rf '{}' \; -print