codehaven: What web applications do I use?

That's the question I will answer now. As long as it's possible I will always use a web-based application instead of an application installed on a PC.

I'll illustrate that by listing the applications I typically install on my PC:

Eclipse Java IDE (programming editor)
Putty SSH client
7-ZIP
PDF reader
Tortoise SVN client (source control)
Skype
Firefox & Google Chrome

For everything else I use these tools:

Yahoo Mail - might convert to Gmail at some point, although Yahoo mail is a great application
Google Docs - instead of Word or OpenOffice. More than good enough for me.
Google Reader - reading RSS feeds, my main source of technology news
Twitter - social networking and a great source of technology news. I follow many of the big names in the industry.
Facebook - it's not all business, through Facebook I get a feeling about what old and new friends are doing.
Remember The Milk - excellent task management that integrates with everything.
Assembla.com - hosted Subversion (source control) and Wiki. Perfect for programming projects.
Delicious.com - Social bookmarking site. I keep my bookmarks there.
Digg.com - Users are voting the most interesting news in many categories. I follow a few tech categories on a regular basis. Lot's of interesting stuff here.
iGoogle. Portal that gives me a unified view of information from Twitter, Facebook, Google Reader, Google Notebook, Digg, Delicious, Remember the Milk and Yahoo Mail. Well, that is almost everything. My most visited website.
Last.fm. Gives you your own radio stations based on the artists you like. Free and amazing. Until the media industry gets their act together this is my main (and almost only) source of music.
Meebo.com. All the major chat clients in your browser, and you only have to remember a single username and password.
Blogger.com. Lets me blog with my google user profile...
LinkedIn. Professional networking. Excellent way to keep in touch with former colleagues.
Plaxo.com. Professional networking. Share contact information with your current and former colleagues.
Dropbox.com. Not much need for physical file-sharing or file-storage when everything is already in the cloud. For the occasional need dropbox is doing the job and staying out of the way.

All the applications work well in the browser on my Nokia mobile phone. I do not really consider a web application seriously unless it's optimized for the mobile web. I do not use mobile phone client applications much, they have the same problem as desktop applications... Last.fm is an exception.

I'll add that for most of the applications above I have tested one or more competing services. The one I am using is the one I have found to be the best one. Ease of use, mobile presence and open API's for integration with other web based services are a few of my main criterias when selecting a web based application.

Oyvind