I am looking for a site or sites that offer information about what's
new in small file, casual, downloadable games.  There are literally
hundreds of sites that offer these types of games, but I can't find
one place that tells me what is new across all of them, or that tells
me which ones are better than others.  I guess what I am looking for
is the Gamespot of casual downloadable games, but I can't find it.

http://www.gamextazy.com/ seems to be quite a large site. A site of
the same scale as Gamespot couldn't be expected for small file,
downloadable games; the market of these games is generally much
smaller than that reached by commercial games and hence creating a
site that is only going to attract a small number of users would not
seem as rewarding to some.

Anyway, GameXtazy's 'About' page reads:

About GameXtazy DinoByte Archive.
GameXtazy Archive is an extremely popular resource for fans of
high-quality advanced games. We have more than 1100 games, which would
satisfy anybody?s taste: arcades, chess, tetrises, logic, puzzle...
the best and most popular shareware and freeware in the Internet. With
our games you won't ever have a fit of the blues!

Not sure if this is what you were looking for, but you can have a look. :)