You need a system to track your calendar, project lists, and actionable tasks. Here are three suggestions for Google Apps users.
Google Tasks hides nicely inside Gmail and Google Calendar. In fact, it hides so well, you may not even know it exists. To view Tasks from within Gmail, click the triangle to the right of the large "Mail" icon in the upper left, above the list of mail labels. Choose Tasks from the drop-down. Google Tasks will display in the lower-right corner of your screen.
You can create Tasks and Calendar events from an email. (Click the "More" menu above an email to see these options.) A Task created from an email displays a "Related email" link below the task; click on the link to view the original email. A Calendar item created from an email fills the event "Description" with the most recent text from the body of the email.
Google offers an incredibly useful tool for managing date-specific task lists: Google Calendar. To view Tasks within Calendar, select the "sprocket menu" in the upper right area in Calendar, and then choose Settings. Select the "Calendars" tab menu item. Make sure the checkbox next to the calendar named "Tasks" is selected to "Show in List". The Task list will display to the right of your calendar. Tasks with dates appear on the assigned day, in an area above hourly calendar information. These day-specific tasks display a checkbox next to them, which you can use to mark tasks as complete.
For Chrome browser users, there's also a Google Tasks extension. When clicked, the extension installs to the right of the URL box and displays your task lists in your browser. You can work with your lists from the browser extension. Unfortunately, tasks shown aren't sorted in chronological order, which makes the list nearly unusable for time sensitive tasks.
Surprisingly, Google doesn't offer Android or iOS Tasks apps. Even more surprisingly, the Task calendar doesn't sync to mobile devices. Instead, Google Tasks are web-only: go to http://gmail.com/tasks to view and edit tasks on a mobile device. Third party apps, such as GeeTasks-Pro on iOS ($6.99) and Tasks on Android ($.99), attempt to fill the gaps.
Todoist.com ($29/year per user) offers enterprise users Google Apps sign-in integration. After an administrator adds the app from the Google Marketplace, users login by picking Todoist from the "More" drop-down menu at the top of the browser.
Todoist provides a cleanly-designed web app, along with native Android and iOS apps. The Todoist Chrome extension matches the functionality of the Google Tasks extension: you can view and modify your lists from the extension in your browser.
Todoist differs from Google Tasks in two important ways. First, tasks display differently. Google Tasks display in the same window as Gmail or your Google Calendar, which makes glancing at tasks easy. Todoist tasks display either with a click of a browser extension or in a separate browser tab. There's more attention-switching, instead of glancing. Second, Todoist syncs date-specific tasks to Google Calendar once-a-day, unlike date-specific Google Tasks, which sync instantly.
Doist, the maker of Todoist, also offers a project management solution, Wedoist. The solutions are available separately or in a bundled enterprise solution, called istenterprise.com.
GQueues.com offers Google Apps integration, along with native Android and iOS apps. The GQueues Chrome extension enables one-click task creation. (Pricing starts at $25/per user, with discounts down to $10/per user for purchase of 25+ licenses.)
GQueues empowers managers to delegate tasks. Add a person's email address to assign them a task. They will receive a task notification. When the assignee marks the task complete, your list will automatically update. And, yes, people can decline tasks - or even block people from assigning them tasks, so don't go overboard when delegating work!
GQueues Gadgets work with Gmail and Google Calendar. The Gmail gadget lets you create a task from an email, without leaving Gmail. The Calendar gadget displays tasks with upcoming due dates to the right of your Google Calendar.
GQueues elegantly solves the problem of calendar syncing with a dedicated "GQueues" Google Calendar. After the user activates the GQueues calendar from their GQueues settings, the GQueues calendar appears with all other viewable user calendars. Tasks with due dates are added or removed from GQueues calendar, and changes are reflected instantly.
A tool equal to the task
Google Tasks offers basic list management, but oddly lacks Google-made native mobile apps. Todoist offers robust list management from multiple platforms, but once-a-day Google Calendar syncing may not be enough for some users. GQueues provides robust list management, and better integration with Google Apps.
You need a system to track your calendar, project lists, and actionable tasks. Any of these three systems will help you do that. But there is one more system worth considering. Ben Franklin, productivity guru of the 18th century, managed his lists with pen and paper. For some people, that still works best.