iTalk [AppStore, Free]

This is another free useful application for iPhone and iPod2 from Griffin Technology. It allows users to turn iPhone, iPhone 3G or Pod 2 into a recording device. iTalk's uncomplicated user interface lets you start/stop, choose Good/Better/Best sample rates, and manage the list of your recordings, all with just one finger.

• High-quality handheld recording using your iPhone or 2nd-generation iPod touch
• Easy, convenient user interface and controls
• Drag & drop wireless file transfers to your computer
• User-selectable 11.025 kHz, 22.05 kHz, or 44.10 kHz sample rates

Avaliable for free in AppStore (link).

You can sync recordings using iTalk Sync application that should be installed on Mac or PC.