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A Transparent, and a Black Google Logo.
* Merged *
* Fixed Purple G *
Google is the best search engine!

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A Transparent and a Black YouTube Logo.
* Merged *

Logo: 

A folder with the Fast Dial Colors and Logo. Made with Fireworks CS3.
Tell me what you think about it in the comments!!!!!!
Higher resolution version here.

Please Vote!!!!

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Transparent Logos for WikiPedia.
Thanks to sjdvda for a dark text version.
> Best in Black <

Logo: 

A set of various gaming logos for game related sites. Original vectors not made by me, though I can't remember the site I got them from. I simply put them in a transparent png correct ratio and added the reflections.  read more »

1. Atari
2. Sega Dreamcast
3. Nintendo GameBoy Advance (GBA)
4. Nintendo GameCube
5. MAME
6. Sega Megadrive
7. Nintendo 64 (N64)
8. Nintendo Entertainment System (NES)
9. Sony PlayStation 3
10. Sony PlayStation Portable (PSP)
11. Super Nintendo Entertainment System (SNES)

Logo: 

A collection of folder icons for your various sub-grids. If you have any requests for additional folders just post a message following this one. Slight reflection on transparent.

Want the entire set? Try this handy-dandy .zip package containing all of the logos in FD Folders! Click here.

Like this folder set? Check out Folders2

Logo: 

My set of gmail logos.

All logos with and without reflection.

1&2 Regular Logos
3&4 Logos with shadow
5&6 Logos with inner bevel
7&8 Logos with White Glow (Best for dark backgrounds)

UPDATE: Added 8 New logos

9&10 White Logos
11&12 White Logos with Inner Bevel
13&14 Black Logos
15&16 Black Logos with Inner Bevel
18&19 iPhone Style Logos

If you want the logos in any other color, just leave a comment below.

Please Vote!!!

Logo: 

Here is the template for all my gloss iPhone app-style icons. Made and fully editable in Fireworks.

If you make these styles of icons please use parameters similar to the ones that I have used, or use this template as others are going to use this and it allows for consistency.

I leave a 1px gap between original and reflection, white path has opacity 36% rounded rectangle is linear gradient of solid colour from 100% opacity at the top to 80% at the bottom.

I will be posting a tutorial on how to make these and how to create a logo from this template in the near future.  read more »

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My logos for Last.fm's new "Paint It Black" Interface.
I used the pictures:
1. http://cdn.last.fm/flatness/logo_black.3.png
2. http://cdn.last.fm/flatness/header/black_right.2.png
3. http://cdn.last.fm/flatness/header/black_left.2.png

Red version here

UPDATE Added iPhone style icon extracted from the Last.fm iPhone App.  read more »

Logo: 

Logos for news.bbc.co.uk all transparent.

White logos best on black.
Black logos best on white.