I have a working prototype of my Template Files module.
It will export your database templates to external files (but will not overwite files which are newer then your database copy).
It will import templates from external files into your database (but will not overwrite db if the db is newer then your file).
Seems pretty safe, but this is a pre-release so I would not run it against data you are afraid to loose.
Development is not complete, there are a number of items missing from what I would consider a final product. You will also notice some of the language values are not mapped yet (like the update result desc).
Any feedback would be great.
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FILE UPDATED
New release is available here
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Here are some screen shots of it in action:
Home Screen:
http://skitch.com/louiswalch/f477/template-files-expressionengine
Result Screen - Exporting Templates:
http://skitch.com/louiswalch/f475/template-files-expressionengine-1
Result Screen - Importing Templates:
http://skitch.com/louiswalch/f475/template-files-expressionengine-2