Listaculous is another productivity webservice that helps you organize and manage your to-do lists. In addition to basic features there are a couple of unique ones: (1) organize to-do tasks by tabs (categories) and (2) embed your task dashboard onto your blog or iGoogle page. The latter lets you login, add, edit and manage your tasks from any webpage where you embed your tasks.

Features:
Go to Listaculous @ www.listaculous.com
Similar Websites: productivity, ToDo / Calendars | Categories: ToDo / Calendars
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Having tried both RememberTheMilk.com and this one (both of which have iGoogle widgets), I would still stick to RTM. It has a lot more features, though the widget is not as shiny.