Noticed that searching on “s” on google went to www.gnu.org caused
me to get curious.

a 1,450,000,000 A word a day
b 192,000,000 http://www.btselem.org/
c 247,000,000 cnet.com
d 297,000,000 dlink
e 407,000,000 E!
f 137,000,000 F-Secure
g 116,000,000 http://www.schirmer.com/
h 134,000,000 hotbot.com
i 670,000,000 yahoo.com
j 119,000,000 www.emboj.org
k 112,000,000 KDE
l 255,000,000 Lsoft
m 226,000,000 www.echo.lu
n 192,000,000 northernlight.com
o 224,000,000 O’Reilly
p 154,000,000 sloan.org
q 70,000,000 q4music.com
r 138,000,000 www.lsoft.com/LISTSERV-powered.html
s 323,000,000 www.gnu.org
t 314,000,000 att.com
u 117,000,000 firstgov.com
v 144,000,000 vday.org
w 139,000,000 The Andrew W. Mellon Foundation
x 167,000,000 Netscape
y 188,000,000 y-me.org
z 93,200,000 zmag.org

Or sorted by popularity:

a 1450,000,000 A word a day
i 670,000,000 yahoo.com
e 407,000,000 E!
s 323,000,000 www.gnu.org
t 314,000,000 att.com
d 297,000,000 dlink
l 255,000,000 Lsoft
c 247,000,000 cnet.com
m 226,000,000 www.echo.lu
o 224,000,000 O’Reilly
n 192,000,000 northernlight.com
b 192,000,000 http://www.btselem.org/
y 188,000,000 y-me.org
x 167,000,000 Netscape
p 154,000,000 sloan.org
v 144,000,000 vday.org
w 139,000,000 The Andrew W. Mellon Foundation
r 138,000,000 www.lsoft.com/LISTSERV-powered.html
f 137,000,000 F-Secure
h 134,000,000 hotbot.com
j 119,000,000 www.emboj.org
u 117,000,000 firstgov.com
g 116,000,000 http://www.schirmer.com/
k 112,000,000 KDE
z 93,200,000 zmag.org
q 70,000,000 q4music.com