I'm a fan of Speakwrite, and lawyer Dave Swanner (South Carolina Trial Law Blog) has this: Use SpeakWrite to record witness interviews.
Dave tells us:
1. Call the witness on the phone. 2. Using conference calling, add www.Speak-Write.com as a "third" caller.
You can also use this to take a recorded statement from your client. You can put the phone on speaker and call Speak-Write. You will get a transcribed copy of the interview and also the digital recording in the client's own voice.