Speedometer chart - a simple image widget to integrate in your site

Example:
A quick way to check your IP.

As a developer your full day means spending time in front of the monitor writing looking at code.
The days when using notepad was a good idea are long gone. The tools can be divided into two categories: text editors and IDEs.
A text editor is ideal for small projects & independent scripts, but not so good with large projects.
I'm using EditPlus editor for many years. It is flexible, fast and safe. Other great text editor is Notepad++.

If you want to keep track of your site, you can't do it without analytics. One of the best features it has is the possibility to set goals and track your visitors movement.

http://analytics.google.com

What needs to be done to make your site blazingly fast has never been easier. YSqow is a plugin for Firebug released by Yahoo. This tool gives you a good optimization report giving grades from F to A on 22 items from 6 categories: content, cookie, css, images, javascript, and server. In addition to grades and clear advices about what you need to do, it has a few interesting tools such as a compressor for css or javascript files which you can download and put in your site, or the images optimizer called Smushit.

Google Toolbar has lots of interesting features, but the important feature for web development is the Google pagerank.

http://toolbar.google.com/

Firebug is probably one of the best tools web-developers.
I'm using it for some years now and I remember what it was like before it. It literally changed my life :). Everything is much easier and I can do more complex stuff, quicker.