[gui-talk] rockbox for MP3 players

[humberto]

Hello list:
Does anyone know where I can get the Rockbox software that makes 
MP3 players, like the Sansa clip, talk? Is this piece of software 
free of charge? if not, how much does it cost? Can it be 
installed directly onto an MP3 player with an application such as 
activeSync or such?
I have a Sansa Clip + 4 gb with me and I would like to make it 
more accessible with this software.  Have you had any experiences 
with this software?