Five Favorite Web Applications of DesignersSource: sixrevisions.com
Webapps–compared to their desktop counterparts–have the distinct advantage of being flexible in terms of the environment they have to run in; if you have a web browser and an internet connection, you're good to go.
SXSW: Lessons Learned at 37SignalsSource: Read/WriteWeb
Currently over one million people and businesses use their productivity applications (including RWW, which is a paying customer of Basecamp). They also are responsible for creating and then open sourcing the popular web developer language Ruby on Rails.
37Signals Experiments in the WorkplaceSource: 37signals.com
At our company-wide get together last December we decided that 2008 was going to be a year of workplace experiments. Among other things, we discussed how we could make 37signals one of the best places in the world to work, learn, and generally be happy.
37signals Featured in Wired (March 2008 issue)Source: 37signals.com
Norman's view seems rather depressing in the way it accepts complexity as an inevitable result of modernity. Dehumanization is a byproduct of the modern age too. But that doesn't mean you just give up and surrender to it. We prefer to put up a fight.
Small Is Essential - 37signals in TimeSource: TIME
At 37signals, a company with just eight employees whose Web-based collaboration software is used by thousands of small businesses, there isn't time to sit around a conference room sipping latte and deconstructing memos.
Compare matrix: Basecamp, Goplan, activeCollabSource: the-getting-things-done.blogspot.com
Program GoPlan is in many respects similar on BaseCamp and ActiveCollab. All of them work through the web interface. Thus GoPlan and BaseCamp are commercial services (are made on Ruby), and less functional ActiveCollab extends with an open initial code (it is written on PHP).

This evening, with very little fanfare, 37Signals, (the company that created Basecamp, Backpack, and Ruby on Rails), has opened up signups for their new CRM web application to the world.
37Signals Basecamp faces competition in free alternativeSource: TechCrunch
Allowing you to download and upload for free onto your own server, a student from Serbia has decided to create an alternative. I don't think it's really an alternative. There is no hosted version and a lot of people don't want the hassle of less support and feature upgrades.

This "hack" uses 37signals' Campfire software as a great note-taking solution for class, meetings, etc.
Fluxiom Unleashed, looks Aweomse!Source: mattbator.net
A side by side comparison of new Web 2.0 collaboration suite Fluxiom, just recently launched, and 37 Signal's popular Basecamp suite.

As a long time (in net years) user of 37 Signals Basecamp product. I am also an avid fan of their development philosophy I have come upon a disappointing situation. It is not secured via https by default.