I've installed the software for my Sony ICD-PX720 Digital Voice Reccorder today. Very nice. The software has an easy-to-use and intuitive user-interface - and converts the recordings to mp3 when you save to disk. I believe the option I selected on installation of the software increased the fidelity of the sound quite a bit.
I am very pleased with the quality of the recordings, and the battery life is very good. I used this device to record all of the interviews I conducted at JavaOne 2009.
I plan to begin using this to record requirements discussions with clients.