Much more than a to-do list, this project management site helps you track how much time you spend on tasks grouped into different projects. You can share tasks and projects, and create new tasks by sending the site an e-mail.
Need to schedule meetings with scattered colleagues on assorted e-mail and calendaring networks? Head over to TimeBridge, which can pull in your Outlook or Google calendar availability and allow participants (who don't have to be TimeBridge members) to choose from up to five proposed meeting times.
The interface of this calendar site lets you quickly create events with tags, invites, Google map links, and more. You can also import up to 100 contacts from Gmail, Hotmail, Outlook, Plaxo, or Yahoo to take advantage of all the sharing that the site emphasizes.
This app can synchronize your Google, Pocket Microsoft Outlook, or 30Boxes calendar with your Outlook XP, 2003, or 2007 calendar. The free versions can handle multiple online calendars but they won't automatically sync (you'll need to click a button in an installed Outlook toolbar).
This program adds a great-looking, full-featured calendar and task list to Thunderbird, Mozilla's excellent free E-mail application. You can create multiple color-coded calendars and pull in events from other online calendars such as Google Calendar.
If you want to see just how much an online application can feel like a desktop program, sign up for the ongoing beta of Scrybe's calendar and note-taking app. Its slick display, with zoom effects when you drill down from month to week to day, will make you quickly forget you're in a browser window. It also has an offline mode, an Outlook-like reminder pop-up, and lots of other nice features.
If you just want a simple and easy list for tracking tasks, check out Ta-da List. It has few features, but you can get it up and running in no time.