Research shows that keeping a journal is great for your mind. It allows you to clear your thoughts or think through problems in different ways. Finding a good way to journal is easy with the Day One app. Designed to provide a feature-rich, modern journaling experience, Day One gives you the ability to keep track of, write about, or create a virtual archive of almost anything you want.

How many of us have said “I really should start a journal,” only to find that even the simple task of sitting and writing for a few minutes is too hard to fit into our daily schedule? With Penzu, there aren’t any more excuses — it turns anything with a screen into a synced, secure journal. And right now a Penzu Pro Digital Journal Lifetime Subscription is just $39, a full 58% off the normal price.

Popular universal iOS journal app My Wonderful Days has been given an update, adding several notable features.

First and foremost is the ability for users to now add videos to their multimedia journals — either shooting one themselves, or else adding an existing video from their iOS device’s library.

Days is a free iPhone app that uses your photos to create a journal of your adventures. The twist is that it takes your pictures and turns them into animated GIFs.

Rego is an app that answers the question “How do I remember this place?” It’s a question partially addressed by Foursquare’s check-ins, and also by Evernote’s location-aware notes. But Rego goes further than both, letting you save places you’ve been to, places you find, and places you have never even seen.

With iOS 6 right around the corner, Google’s official YouTube app for iPhone couldn’t have come at a better time. It’s a great app — much better than Apple’s built-in YouTube app — and it’s headlining this week’s must-have apps roundup. It’s accompanied by Poster, a great new blogging app; Journal for Evernote, and Google Drive.

Evernote Journal is a new, free, Universal app with one simple task: to get your daily journal entries into Evernote. There are already some very polished apps to capture your daily musings – Day One and Momento come to mind, but Journal has the avantage that it stores your daily entries in Evernote, ready for access (and export) wherever you like.

Memoir Tree is a new oral history for capturing memorable moments – including those goofy things your kids say while away at pre-school or that look on your grandfather’s face as he tells those war tales.

Although there might be more iPhone diary and journal apps than pages of the daily doings of Samuel Pepys, the folks behind Memoir Tree want their iPhone, iPod Touch and iPad app to become the app of record for schools, nursing homes, museums and at events, too.