Hmm... I guess I never thought of Sys Req as "features". I would expect it in the release notes (not present) or on the download page (not present). Placing at the bottom of the "features" page is obfuscating, in my opinion, if it is placed nowhere else.

But good of you to find it; I would never have thought to look at the Features page. Again, whiny of me.

And even Canonical forgets it's there; now that you pointed it out, some searching reveals a similar page, http://www.ubuntu.com/products/whatisubuntu/desktopedition, which says it requires 4 GB of space.