Gmail finally has a built in to-do list, a much needed and requested feature. It’s pretty bare-bones, but its there, which is certainly an improvement. You have to enable it through Gmail Labs. From Webware:

Since e-mail is where and how many of us get things done, both in our personal and professional life, why not add a list of things that we may not be able to get done via e-mail, such as a reminder to make dinner reservations?

To enable Tasks, go to Settings in the upper right of the Gmail window and click the Labs tab. Click Enable next to the Tasks selection, click Save Changes. After refreshing Gmail, a Tasks link will appear under the Contacts link. Just click that Tasks link and you are ready to be productive.

Personally, I’m a big fan of Remember the Milk for to-do lists in a getting-things-done fashion. RTM has a Thunderbird plugin, interfaces for iGoogle, netvibes, and twitter, and even a Ubiquity command set. It also integrates perfectly into Gmail, which I posted about here.