
Twitpic is a web 2.0 site for sharing photos on Twitter.
You can easily sign in Twitpic with your Twitter account, the choosen photo will upload to twitpic’s server, and twitter a photo link on your twitter, also you can custom messages.

Except share photos, twitpic also support the comment of photos. Based on the gigantic number of users and twitpi community, it fully compare favorable with other photo share community.

Twe2 is Free Twitter SMS alerts service, include your Direct Messages and @Replies, and even you can set key words for receiving your interesting stuff.
After confirmed your mobile, you can choose the type of Twitter Notifications and Frequency. And Twe2 will record the number of SMS you received and sent.
Although Twe2 anounced that its service is already avaliable in lots of countries, however, till I post this, still not receive the confirmation SMS.
ps: Twe2 will append advertisment to the bottom of each SMS.
From Wikipedia
In software engineering, a web application or webapp [1] is an application that is accessed via web browser over a network such as the Internet or an intranet. It is also a computer software application that is coded in a browser-supported language (such as HTML, JavaScript, Java, etc.) and reliant on a common web browser to render the application executable.
Compare with Desktop Apps, there is no doubt that Web Apps are incredibly portable, and Web Apps can upgrade automatically with new features, and also because Web Apps are abased on browser, so it normally support cross platform.
This site is dedicated to the growing volume of web applications out there. As we come across new web applications, we will keep adding them to the site. Meanwhile, do share with us your favorite web applications if you have any!