46 Use Dropbox to collaboratively care for aging relatives: If the people who are collaborating on an elder's care live in different places, everyone can post updates to medical and personal information in Dropbox, so everyone has the same information; you can also leave notes for each other in a text document.
47 Share photos from your travels with folks back home by posting the pictures from your iPhone to a shared Dropbox folder.
48 If you're the default tech-support person for your friends and extended family, create shared help documents or screencasts that answer the most frequently asked questions.
49 Collect family history documents and photographs from widely scattered relatives in one shared folder.
50 Ask each student to create a Dropbox account and then submit their homework to a shared folder in it; no more "I forgot my computer" excuses.
51 Store reading assignments that are in PDF or some other digital format in a Dropbox folder. If you make annotations in an app like GoodReader, your notes will then be available from anywhere.
Beyond the basics
52 Go to the Send to Dropbox Website (sendtodropbox.com), click on Connect To Dropbox, and provide your Dropbox credentials. You can now email files to Dropbox. That makes all sorts of scenarios possible. For example, create a document in Google Docs and then opt to share it. In the Share drop-down menu, select Email As Attachment and provide your Send to Dropbox email address; the Google Doc will appear in Dropbox's Attachments folder.
53 Open email attachments on the iPad in GoodReader. Review the document and then save it from GoodReader to Dropbox. When you get back to your Mac, a copy will be waiting for you in your Dropbox folder.
54 Use Dropbox as a backup for your backup. Assuming that your Time Machine backup sets aren't too huge, periodically save one of them to Dropbox. If both your computer's hard drive and your backup drive should fail, you could still recover some data. Or, if you notice that your Mac is acting funny, quickly copy important files to Dropbox, in case your Mac really falls apart.
55 Save incrementally between Time Machine's hourly backups: Save a copy of whatever you're working on at the moment to Dropbox, adding some sort of time-stamp to its filename.
56 Create an Automator service that copies or moves selected files in the Finder to Dropbox (with permission to overwrite existing files), and then launches the Dropbox app for immediate synchronization.