ajft

Via http://benjamin.smedburgs.us/blog/2008-11-24/abc-meme/

Instructions: type the letter “a” in your browser location bar and choose the first match from the dropdown. Repeat for each letter of the alphabet.

Browser: Firefox 3.0.4

a: ajft - User profile
b: Bicycle Victoria Forums - View Forum - Cycling discussion
c: cat-v Considered harmful
d: Novell: Downloads
e: Camel - Wikipedia
f: Welcome to Flickr!
g: Google Chrome - Downlaod a new browser
h: http://machinetags.org/wiki/
i: Iometer project - Downloads
j: JRB Software
k: King parrot - Wikipedia
l: ajft's Music Profile - Users at Last.fm
m: Gmail
n: NOVELL: Support
o: Twitter
p: polydistortion.net - andrew j cosgriff
q: QNX Realtime operation system
r: Home - Rate the PLATE Australia
s: NOVELL: Support
t: TinyURL.com
u: ajft's Music Profile - Users at Last.fm
v: Bicycle Victoria Forums - View Forum - Cycling discussion
w: Google Reader
x: QNX Realtime operation system
y: YouTube
z: —

I cheated a little, where the first URL in the dropdown list would be inaccessible to someone other than me, I picked the second... or third... and so on.