Web/Android/iOS: Recently we created a 20 minute, randomly-generated exercise routine for people who are too busy to exercise. If you liked that, you're really going to like Sworkit. Just like ours, it generates random workouts that focus on various parts of the body (or all of it), but it'll work for any timeframe, from five minutes to one hour.
You can use Sworkit as a web app, on your Android, or any iOS device. All you do is choose the amount of time you have to exercise, what kind of workout you want, and then do what Sworkit tells you to do. It'll even time each exercise for you so you don't have to bother with a stopwatch. If you don't know how to perform a given exercise, examples will be shown on screen to help you out. With the exception of offering a 20 minute workout—the intervals jump from 15 to 30 for some reason—it's just about everything you'd want out of an exercise app.
Sworkit (Free)
Yahoo! has released a new extension for Chrome, Internet Explorer, Firefox, and Safari that provides visual previews of search results instead of the typical plain text. They've also launched a new app for iPhone and iPad that wraps the search style into a browser.
iOS: Lifehacker readers' 
iOS: Keeping track of the credit cards, IDs, and other stuff in your wallet is important in case your wallet ever gets lost. Popular password manager LastPass now offers a free app to backup and sync all that important personal information and you can add attachments too. 
