TranscriberAG is designed for assisting the manual annotation of speech signals. It provides a user-friendly GUI for segmenting long duration speech recordings, transcribing them, labeling speech turns, topic changes and acoustic conditions.
I started using TranscriberAG a couple of days ago, so this is not a "serious" review, but I can tell that I quite like it. Not very intuitive, but it has many useful features.
The new TranscriberAG doesnt install under Win7 - try the old Transcriber instead (http://trans.sourceforge.net/en/presentation.php).