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I was just about to post that I do this, but you beat me to it (a more "stable" link is wstein.org/grants). I also put some old job applications here: wstein.org/job. "Now, generally this [reading proposals] is achieved by asking some older colleague to see an old proposal, an approach that works just fine in most cases." There's one other way: if you ever get a chance to be on an NSF review panel, you'll also get to read lots of proposals. If you get a chance to serve in this capacity, take it no matter what!
For future reference, I made a copy of the Grothendieck website's contents before it was taken down, and posted it to my Grothendieck site: wstein.org/sga