This is a Cover Flow-esque logo for Interfacelift.com. It has a transaparent background and looks nice on dark and light backgrounds, although I think black looks best.

Made this logo myself from the logos different community sites.

Logos I used (letters in capital):
c - faCebook
o - orkut
m - gaMespot
m -gaMespot
u - youtUbe
n - linkediN
i - hI5
t - lasT.fm
y - mYspace

UPDATE: Added 6 New versions of the logo with different effects.

All logos with and without reflection
1&2 Regular Logos
3&4 3D Logos
5&6 Logos with glass effect
7&8 Logos with inner bevel
9 iPhone style logo

Please Vote!!!

Fast Dial logos for Fast Dial (Based on the logos created by k-dash).
They look better on dark backgrounds.
I don't know if there is a specific font for FD so I used my favorite font: Babylon Industrial.
I normally use these logos on every folder page and set the shortcut to chrome://fastdial/content/fastdial.html so I can return to the main FD page quickly.
You better use the transparent ones, the ones with black backgrounds are only for illustration!

UPDATE: I added better resolution ones based on the bigger logo by mafi0z, I kept the old ones to show the difference.

[English]

Userlogos logo. All of them are transparent.

1. 3d logo for black and dark backgrounds.
2. 3d logo for white and light backgrounds.
3. Flat logo for white and light backgrounds.
4. Flat logo for black and dark backgrounds.
5. 3d cube, flat text logo for black and dark backgrounds.
6. 3d cube, flat text logo for white and light backgrounds.

[По-русски]

Лого Юзерлогос. Все с прозрачным фоном.

Looking for Group comic started out as being based on the popular video game by Blizzard, World of Warcraft.