Since upgrading to a 3G iPhone, I've gone on periodic app binges in which I download every app that looks remotely interesting and take it for a whirl. So far, the best discover I've made is a free app called Evernote -- and it's changed my computer use even more dramatically than it's affected the way I use my iPhone.

Evernote is a notetaking application that lets you take notes on your computer (Mac or Windows) and keep those notes synced with your iPhone and the Evernote web site. Any note that you take on your iPhone gets synced back to Evernote, too. You can keep multiple notebooks (e.g. one for draft blog posts, one for grocery lists, and one for each client project) and choose to keep some or all of these notebooks local (just on your computer) or online (synced by Evernote). While you can keep as many notes and notebooks as you want on your local computer, the free version of Evernote limits data uploads (i.e. syncing) to 40 MB a month. But it only costs $5 per month to get an account entitling you to 500 MB of data uploads, which Evernote says is enough to hold thousands of typed notes, five thousand snapshots, or 450 audio notes.

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