The components of my signature:

Late (Hidden Track)
Kanye West
Late Registration
2:04.2
2:06.2

Oh! How The Dogs Stack Up
Mogwai
Come On Die Young
1:02.8
1:03.9

You Know What You Could Be
Incredible String Band
The 5000 Spirits Or The Layers Of The Onion
1:24.2
1:25.6

Have A Talk With God
Stevie Wonder
Songs In The Key Of Life
2:07.5
2:08.7

The Greatest
Cat Power
The Greatest
2:27.3
2:28.8

Stars And Sons
Broken Social Scene
You Forgot It In People
0:53.4
0:54.7

Glósóli
Sigur Rós
Takk...
3:15.9
3:17.8

Holy Mountains [Explicit Album Version]
System Of A Down
Hypnotize
1:06.8
1:09.1

No Satisfaction
Black Mountain
Black Mountain
0:30.6
0:32.3

Sunshine And Clouds (And Everything Proud)
Clap Your Hands Say Yeah
Clap Your Hands Say Yeah
0:54.1
0:55.9

Grass
Animal Collective
Feels
2:11.8
2:14.6

In Every Dream Home a Heartache
Roxy Music
For Your Pleasure
0:08.0
0:09.6

Don't Think Twice, It's All Right
Bob Dylan
Greatest Hits Vol. 2
0:25.0
0:27.5

Do The Oz
John Lennon
Plastic Ono Band
0:41.8
0:44.1

I Am The Walrus
The Beatles
Magical Mystery Tour
4:23.1
4:25.2

'84 Pontiac Dream
Boards Of Canada
The Campfire Headphase
3:00.1
3:03.0

Schrapnell
Isolée
We Are Monster
4:48.6
4:51.0

The Black Hawk War, Or, How To Demolish An Entire Civilization And Still Feel Good About Yourself In The Morning, Or, We Apologize For The Inconvenience But You're Going To Have To Leave Now, Or...
Sufjan Stevens
Come On Feel The Illinoise!
1:02.1
1:04.8

Pete Standing Alone
Boards Of Canada
Music Has The Right To Children
0:23.4
0:26.0

minutiae
prhizzm
prhizzm ep
2:15.3
2:18.3

I tend to listen to my ipod more than my computer, so this is a little out of date. not that inaccurate, though:

link

signature:

Starman
Bowie, David
Ziggy Stardust
3:10.1
3:12.2

Sixteen Military Wives
The Decemberists
Picaresque
0:25.5
0:27.0

Dirty Water
The Standells
The Best Of The Standells
1:42.0
1:44.8

Prairie Fire That Wanders About
Stevens, Sufjan
Illinois
2:04.1
2:05.5

Horsell Common and the Heat
Wayne, Jeff
War Of The Worlds (CD1)
0:00.0
0:02.9

Source Tags & Codes
...And You Will Know Us by the Trail of Dead
Source Tags & Codes
4:53.5
4:55.2

Almost Crimes (Radio Kills Remix)
Broken Social Scene
You Forgot It In People
0:05.2
0:07.8

The Body Breaks
Banhart, Devendra
Rejoicing In The Hands
0:13.2
0:14.3

they're stealing our coal
Wilder, Anand
Anand Wilder's Album
1:34.2
1:36.9

Alpha Beta Gaga
Air
Talkie Walkie
0:28.8
0:31.2

Marooned
Wire
Chairs Missing
2:16.0
2:17.9

The Late Great Libido
Menomena
I Am The Fun Blame Monster!
3:39.6
3:41.6

Electronic Performers
Air
10,000 Hz Legend
4:03.9
4:05.2

Heroes And Villains
Wilson, Brian
Smile
1:49.0
1:51.3

In This Home On Ice
Clap Your Hands Say Yeah
Clap Your Hands Say Yeah
1:19.6
1:22.1

Strange Magic
Electric Light Orchestra
Face the Music
0:48.1
0:49.3

Modular Mix
Air
Premiers Symptomes
0:14.4
0:16.2

The Conductor
The Faint
Danse Macabre
3:21.4
3:23.0

Happy
Wrens
The Meadowlands
2:04.2
2:06.4

Free
Cat Power
You Are Free
2:49.7
2:52.7

how can i do it?

assuming you have a mac and firefox you can just click on the link and follow the prompts, keeping all the defaults (at least that's what i did). No idea if it works on other systems. i bet there's assumptions about where you put itunes, etc.