http://news.ycombinator.com/item?id=84040 (found via http://searchyc.com/hackerne.ws?sort=by_date_r) — Sounds like he's offered to do so in the past.

Why should he donate it? He should sell it. If PG decides it adds usefulness, guy should at least get the purchase price back, if not more.

Obviously it's just a convenient domain name, so he won't sell it for a lot of money, but should sell it for _something_. PG can afford a reasonably priced domain, I think.