Eclipse has pretty good code-formatting control for Java, quite customizable. It's very nice in that:

  * you can elect to turn off formatting for sections of your code
  * you can save/export your formatting convention in an XML file that looks like this: http://pastebin.com/fKjKRuZg
  * you can import that code convention into new/other projects
  * you can select any number of files or projects and choose to apply the formatting to the Java source
  * the result is very readable

This might not tie in directly to your source control tool as is but would make taming and standardizing source from multiple developers a bit easier. As long as every contributor's code eventually is coerced into this form your own/central copy can easily be diff'ed across versions. Also, you could apply other conventions with other formatters for clients that see things differently.