UPDATE: check web.forret.com podcast feed buttons

I am looking for a good Podcast logo, something as slick as the AntiPixel buttons for RSS feeds.
I actually would like to see a logo that has the acronym ‘MP3’ in it, because I think there will be podcasts with MP3, with AAC, RealAudio, WMA, … audio files. Even if these formats are not yet supported by most devices, they do work on a PC. Subscribing to a RealAudio podcast feed is an easy way to get all the latest songs/mixes (e.g. backroomsounds.blogspot.com) automatically downloaded into a folder where RealPlayer can pick them up next time it starts. As universal as MP3 may be, it does not deliver the same sound quality at 32 kbps as RealAudio or WMA, and if one has to choose between delivering 15MB RM files or 30MB MP3 files, bandwidth pricing might come into play.
There is a discussion on whether podcasts that use BitTorrent should have 2 separate feeds or include both links in 1 feed. Personally, I prefer the latter scenario (let the aggregator decide what it supports/prefers). So I don’t see the need for making clear in the feed icon that the feed includes bittorrent or not.

source podcast feed podcast file
Tim Madden Podcast logo - dark grey
Podcast feed - pink
more …
Podcast file - light brown
Kristopher Smith Podcast logo - brick red
Podcast logo - yellow
more …
 
Michael Levin Podcast feed - with iPod  
Peter Forret (me 😉 Podcast feed - Feedburner Smartcast  
iPodder Podcast feed - iPodder  
Dave Winer   Podcast file - radio.weblogs.com
Ross Rader   Podcast file

Update Dec-03:

forret.com
with MP3/WMA/RM specified in the icon

Podcast feed - MP3 files

Podcast feed - WMA files
Podcast feed - RealMedia files

pochoirs.de

Podcast feed - RSS

grandforkscity.com

Podcast feed - RSS

ipodderx.com

Podcast feed - RSS
Podcast feed - RSS

Update Dec-22:

Ross Barber
Sound file icon in ShockWave,
with integrated player (Nice one!)

Flash icon

Update Jan-08:

Doppler Radio

Doppler Logo 3
Doppler Logo 2
Doppler Logo 1

Update Jan-22:

Peter Forret via
Kalsey Button-Maker

MP3 podcast
RAM podcast
WMA podcast
OGG podcast

Update Jan-23:

sparks.blogmatrix.com

Update Dec-16 2005:
see New podcast icons based on Firefox/IE feed logo for 16 logo’s like this: podcast feed