I have been a user of Remember The Milk (an online to-do list) and Gmail (Google's online email service) for quite some time now. Earlier this week RTM released a Firefox plug-in which integrates your to-do list right into Gmail.

The user interface nicely matches Google's look and feel and the level of integration is quite impressive. You can create a new task when you star or label an email. It detects names of contacts and it looks up upcoming entries on your calendar to detect due dates. All very impressive.

It's really worth a closer look...,