You know this isn't specific to the iPhone. All the above can be done with the current selection of Android smartphones; in fact most smartphones in general.

I use my DROID with Evernote to record ideas when driving. My brain often kicks in during my commute to and from work. Voice memos are an effective way to get them documented before I forget. The nice feature of Evernote is the cloud storage. I can immediately pull the message up on my PC when I get home, or from any computer with internet access.