Evoca is an online system (free for 60 minutes, monthly fee for 200 minutes) that allows recording, saving and searching digital voice messages.  It’s used for many purposes, but the website includes a page devoted to oral history.

From the website:

Evoca enables oral historians to:

• Record and store an oral history project in one place.
• Preserve existing recordings in digital format.
• Search audio recordings – the results will actually pinpoint the word you are looking for!
• Transcribe interviews
• Translate interviews
• Spread histories around the world!