Convert mp4 to mp3 ... Extract Audio from a Video file or a part of it

Pazera Free Video to 3GP Converter is the freeware application which converts the most popular videos (AVI, DivX, XviD, MPEG, MPG, WMV, ASF, MOV, QT, FLV, SWF, MP4, M4V, 3GP, 3G2, MKV, VOB, DAT) into mobile phone video format (3GP or 3G2). The application allows you to convert full movie or selected range only. You can limit output file size and set many parameters used by encoder: audio and video BitRate, fps, resolution, sampling Frequency and other.

The most important features: 

Conversion from AVI, DivX, XviD, MPEG, MPG, WMV, ASF, MOV, QT, FLV, SWF, MP4, M4V, 3GP, 3G2, MKV, VOB, VCD DAT to 3GP or 3G2. 
Supported video codecs: H.263, MPEG-4 AVC, XviD. 
Supported audio codecs: AMR-NB (AMR Narrowband) and AAC. 
Large number of options. 
2-pass encoding which will Improve the video qaulity. 
Saving and restoring encoder settings. 
Don't need any installation. Just Extract ZIP archive and click videoto3gp.exe. 
Portability. This program can be run from portable devices. 
Supported languages: english, polish. 
100% freeware! - for private and commercial use. No limitations, no watermarks, no adware, no spyware. 

Application to efficiently manage your iPod :Floola.com

Floola supports almost all features offered by iPods including photos, artwork, podcasts and smart playlists!

It automatically converts any incompatible audio or video file so that you can copy almost any file to it. It allows adding youtube and myspace videos with a single click. Now it even makes it possible to keep your Google calendars synched!

Manage Music, Videos, Podcast and Photos all in one simple app, anywhere on any computer.

Midomi : Use your voice to instantly search & connect to your favorite music

Midomi is a  really cool app to put a name to that tune that's been stuck in your head buzzing round and round, to figure out the unknown song or earworm bugging you which you can't get out of your mind, why not try midomi. Even if you can't remember the whole song, you can simply feed it the few notes you can remember. It's able to identify a song from a fragment of the melody, from just a few bars or lines..

It lets you search online for songs and other music in any of 6 languages, free. Just sing, hum, whistle, play etc the tune into your computer microphone or headset (or, in future, pick it out on an on-screen piano keyboard). And it actually works! What's more, it's a classic Web 2.0 service with user generated content and social networking for singers and music fans. Their searchable database of music (which their music recognition search engine uses for matching voice search queries) is 100% user-generated - it's been built up entirely by their registered members recording and submitting the music of their choice. And registered users can rate and comment on other members' renditions, share recordings they like, add recordings to their playlists etc, too. It also serves as a digital music store, if you want to buy the music that you've found through your search.
http://www.midomi.com