Android: Adding events with the native Android calendar app is often an exercise in frustration as it takes multiple taps to add even a simple reminder. This can lead to using your Android device to only view appointments and increases the chance you'll forget to add an event if it takes too much time to capture. The Quick Event app solves this by allowing you to create new events with a short message using plain text.
The app is easy to use and the messages sent from it update your Google calendar immediately. In my trial the only downside is that you have to use the syntax provided by the developer. Sending "Dr. Smith July 23 3pm" will create an event called "Dr. Smith 3pm" on your calendar for July 23rd, but it will not schedule the event in your 3pm slot. To do that you must use the word "at" either spelled out or by using the @ symbol. "Dr. Smith July 23 @3pm" will place a one hour event properly at 3pm. As you're entering your event text in Quick Event you can always tap the Edit button to add more options such as location, reminders, and the like.
As long as you take the above caveat into consideration you should find Quick Events is a great help in capturing events while away from your workspace.
Quick Events is a free app that requires Android 2.1 or better.