The .gitattributes system together with input/output filters has already proven exceptionally useful for me. I've got some co-workers which do not seem to care about CRLF line endings or whitespace damage.
core.autocrlf = input
and
[filter "whitespace"] clean = stripspace smudge = cat
and
*.php filter=whitespace *.tpl filter=whitespace
saves me minutes every day when I review changes made by others, because otherwise the diffs are getting illegible (Sometimes, the whole file is shown twice only because the line-ending changed)
It would be really great if these features were included in the next release.
Thanks, Matthias