Many moons ago Yoann Padioleau put together a linux git repo with full history going back to 0.0.1. (The older releases aren't tagged, but it's all there for annotate and bisect and such.)

His web page on it is still up, but the download links have bit-rotted. For historical purposes, I've mirrored his old build scripts and the resulting tarball.

Here's a more up to date version as of the 3.0 release, which pulls from the linux.git url instead of the old linux-2.6.git. Download this, extract it, do a "git checkout -f; git pull" and you should be ready to go.