There is WIDI

http://www.widisoft.com/

There's a VST version of WIDI as well, which works live :)

Or Digital Ear

http://www.digital-ear.com/digital-ear/index.asp

Or Intelliscore

http://www.intelliscore.net/

Melodyne as named before should be coo.. but maybe u need to check the tutorial, there is a simpler form as well, it's called melodyne uno i think :eyes: