xplrionet can do this, in conjunction with other xpl software aps. see my post about xplrionet http://empegbbs.com/ubbthreads/showflat.php/Cat/0/Number/226192/an/0/page/0#226192

getting tts going is a little more involved. you need to dl microsoft sapi 5.1. you'll also need xplhal from www.xplhal.com and xpl_riotts ( http://www.xplhal.com/xpl/xPL_RioTTS.zip )

i use it w/ xpl_phone to send caller ID info to my garage rio whenever someone is in the garage. if playing something, the rio will interrupt it w/ the TTS announcement & then switch back to your music feed. if the rio is off, it will still announce.

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It would be cool to have be able to cue up Ebooks or RSS feeds and have them text2Speeched through the rio. Maybe it could be run as a transcoder application through jrec. like a dynamic audio book.