Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
Twicca - Twicca is a Twitter client for Android that is simply awesome. Features: * Notification
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Flamingo for Twitter - Flamingo for Twitter is a bright and colorful Twitter client that comes with a simple interface.
Better Uptime - We call you when your website goes down
Tweetlogix for Twitter - Tweetlogix for Twitter is the most leading Twitter tool that allows you to enjoy Twitter with a powerful and customizable client.