Basecamp is a cool web app to track projects. It handles todo’s, milestones, attachments and team communication. There is a single-project free version and three multiple-project paid versions. I haven’t used it myself but it looks useful.
Periscope is a gadget that lets you track the progress of your Basecamp projects. It was originally just an iGoogle gadget, but the just released a Gmail gadget version. It seems to suffer from some of the same problems as the Remember The Milk gadget for Gmail – the area Gmail allows for it is quite narrow and some elements get cut off.

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