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Producteev, the up-and-coming task management service which launched the newest version of its service earlier this month, just launched its first API. With this release, developers can now make use of Producteev's scheduling back-end to create their own online, desktop and mobile front-ends for Producteev or integrate the service into their existing apps. The company is also launching a developer contest, with a cash prize of $2500 for the winning app and $1000 for the runner-up.

By default, task managers are not necessarily the most exciting applications. ReQall, however, is not only one of the better iPhone task managers, but is also trying to make a business out of it by launching reQall Pro today. For $2.99 a month, reQall Pro users get a large number of new features, including Outlook and Google Calendar integration, geotagged events, SMS alerts, and integration with contacts that are already stored on an iPhone (iTunes link) or BlackBerry.

We heard about a new to-do list service today: Tasck. Tasck is a web-based application that stands out because of the pure simplicity of the service. Another to-do list service, KonoLive, just released a major update to its service and now features integration with Google Docs. KonoLive is an Adobe Air-based application that focuses on sharing to-do lists with groups. There are, of course, already plenty of to-do list managers available on the net, but both Tasck and KonoLive put their own spin on this established genre.

Gmail has been limping along for days, with scores of people reporting down time, super slow responsiveness and other troubles. With no communication from Google about the problem - what are users to think? Perhaps that we should put more of our lives in the hands of the Gmail team!

This afternoon the GMail team announced the addition of a new feature in the Gmail Labs - a Task Manager, or to do list. It's quite an elegant little feature, when it and the rest of GMail work. Below we've got a two minute video tour that shows how the feature works, in case Gmail is down for you and you can't see it for yourself!