UPDATE Actually not a very good option, see comment
In fact, you can avoid loading the entire history of forcing by specifying --depth when cloning, this should make the download size pretty close to the classic tar.gz archive.
See Git small submodules for more details.
In your case for Boost Bind, this would be git clone --depth 1 git://gitorious.org/boost/bind.git , and then link the repo as a submodule (see related post).
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