[quote]location /weblog/ { rewrite ^/(.*)$ /blog/$1 permanent; }[/quote]

Thanks, meto! I had tried that as well (sorry for not posting all of
the regular expressions I tried - I lost track of them all), but it has
the same effect; i.e., everything still redirects to the /blog index
page, even links like /weblog/foo.html, /weblog/bar/, etc.