Evernote is a free tool for keeping track of all kinds of information: tasks, web pages, parts of web pages, pictures, and business cards. Besides capturing textual information, Evernote has an optical character recognition feature that turns words from pictures into searchable information — you can take a snapshot of a business card or label, upload it to Evernote, and it will scan and index the textual information! (It worked with the examples I’ve tried!) You can download a client for WIndows or Mac, but also sync your local information to the web, so that you can access the information you’ve saved from any computer. There is also a version for the iPhone/iTouch and WIndows Mobile, both of which allow you to record voice notes. See: http://www.evernote.com.
If you try Evernote, leave a comment and let us know how it worked for you!