Sennheiser Handmic Digital
($259.95) I love podcasting, both at iPhone Life and in my spare time. I have found this handmic to be an awesome tool for gathering person-on-the-street interviews and other spontaneous recordings. It connects to your iPhone's Lightning port and records audio either through the Camera app (if you want to capture video too) or through the companion Apogee app (which is what I use). I find wired mics to be more reliable than wireless lavalier mics, as long as you remember to talk close to the mic in order to avoid muffled audio. When you're done, just share your recording to Dropbox or another cloud service, and you're good to go!