I settled on the iPhone (originally it was my Windows Mobile Phone), it's camera, and some apps. The first step for me was Evernote. This is an amazing note taking application that runs on multiple platforms - Windows, OS X, iPhone, Blackberry, Windows Mobile, Android, etc. - the fact that it does so was the biggest reason I chose it. Also, it's free (you can pay for more storage and features which I do) and it stores a copy of your data locally on your machine and remotely on their secure website. It also takes information in a variety of forms: Text, Pictures, Audio, Web-clips. As you take these "notes" you can save them to a "Notebook", and tag them to make them easier to find.