Gmail's Task List can now be shared thru email

Google has decided to enhance the task feature that has been integrated into Gmail and other Google products so other users can share their lists with others. Gmail users can now opt to share an entire task list in a new email message. This enables the transfer of all of your tasks including pertinent information like due dates as well as any tasks that have already been completed which normally show up as being crossed out.

Please take note though that this only works with Gmail and not in other Google product where tasks can be found, like Google Calendar, the mobile version of Gmail, and iGoogle. However, the e-mailing feature will surely make its way to each of these places soon enough as Google is known for its light-speed development.
Gmail Tasks is actually the one and only feature to "graduate" from the Gmail labs, Google's test bed for new and experimental features. This feature was launched in early December of 2008, and it graduated from the labs last month. The other labs-only features, including the other 13 developments that were launched alongside the release of the labs program, still need to require user action to be enabled.

Source: CNET.com