browser to the max

Had to start here, the homepage of the service I'm using to create this trail. Guide people to the sites you think they'll be interested in, and make annotations.

GMail is well-known for its generous storage and innovative use of tags. GTDGmail makes a more useful range of tags tied directly to the actions you need to take related to the mails you receive. It also makes applying tags a much faster process.

This is quite an impressive drawing tool, and being able to do it collaboratively is pretty revolutionary.

Not as famous as Writely, but just as good, the free Zoho Writer is here, alongside online collaborative spreadsheet, presentation, and many other tools.

A highly capable and intuitive relational database system on the web. Depending on the plan you choose, you could have multiple users building the database together and share it over the web. The cheapest advertized price is $10/month, but academic/non-profit pricing is also available.

30Boxes does calendaring right. RSS feeds to iCal and everything else. Selective sharing. Amazing parsing in the one box entry form (e.g. "lunch feb 12 +joe@aol.com reminder 1 week" will set up the appointment, invite Joe, and give you a reminder). The best thing is the tagging, and it's so strange that Google threw away what they had learned about tagging from GMail, opting for the rigid "1 calendar for work, 1 for personal" model.