Windows Phone Thoughts: Customize Your Alerts With Watchflag

"Watchflag provides flexible alerts for email and text messages on your Windows Mobile device. Alerts are based on rules you define and work with all synchronized folders. Rules can be customized by sender, recipient, subject, importance level, folder name and content of the message body. Watchflag will play distinct tones, vibrate, flash the LED and display a color-coded acknowledgment screen for direct access to new mail."

If you're used to the sophisticated rules system on the desktop Outlook client, Outlook Mobile is a bit of a letdown - when you get a new email, no matter who it's from, you get the same type of alert. Watchflag changes that with some very clever, though not very pretty, on-device software.