i love this Add-on.
really works for me … Form History Control
Category: Tools – That i like
Appends .html to the URL of PAGES when using permalinks
As a developer i do need search and replace some text on many files and need this for sometimes for subfolder and to make it simple i like to use grepWin. its a real nice software to use and it save many of my time,,, you can try also ….
Introduction
TCPView is a Windows program that will show you detailed listings of all TCP and UDP endpoints on your system, including the local and remote addresses and state of TCP connections. On Windows Server 2008, Vista, and XP, TCPView also reports the name of the process that owns the endpoint. TCPView provides a more informative and conveniently presented subset of the Netstat program that ships with Windows. The TCPView download includes Tcpvcon, a command-line version with the same functionality.
Using TCPView
When you start TCPView it will enumerate all active TCP and UDP endpoints, resolving all IP addresses to their domain name versions. You can use a toolbar button or menu item to toggle the display of resolved names. On Windows XP systems, TCPView shows the name of the process that owns each endpoint.
By default, TCPView updates every second, but you can use the Options|Refresh Rate menu item to change the rate. Endpoints that change state from one update to the next are highlighted in yellow; those that are deleted are shown in red, and new endpoints are shown in green.
You can close established TCP/IP connections (those labeled with a state of ESTABLISHED) by selecting File|Close Connections, or by right-clicking on a connection and choosing Close Connections from the resulting context menu.
You can save TCPView’s output window to a file using the Save menu item.
More info …http://technet.microsoft.com/en-us/sysinternals/bb897437.aspx
For developer who work for PSD to XHTML Conversion jobs, i think the firefox adons 
is a must…
About Pixel Perfect:
Pixel Perfect is a Firefox/Firebug extension that allows web developers and designers to easily overlay a web composition over top of the developed HTML.
By toggling the composition on and off, the developer can visually see how many pixels they are off in development. Pixel Perfect also has an opacity option so that you can view the HTML below the composition. By being able to see both the composition and the HTML you can now simultaneously use Firebug while Pixel Perfect is still in action.
Although we do understand that all browsers render slightly different, and sometimes even OS dependencies come into play, we still believe Pixel Perfect is a great tool to help keep the integrity of the perfectionist designer.
Speed up your store by combining, compressing and caching JS and CSS. The extension ( Fooman Speedster )reworks how Magento handles the loading of JavaScript and CSS. It utilises the Minify library developed by Steve Clay and released under a BSD license.
About Fring..
fring™ is a mobile internet service & community that enables users to talk, chat & interact with other fringsters™ and their online communities, from their mobile phones.
Originating from a vision of freedom, fring was born out of a desire to fundamentally change the way people communicate. The fring founders, veterans of the mobile, internet and high tech industries, joined together to create an easy to use, consumer-centric, truly converged peer-to-peer service, enabling its users to take control of their online communications from one single place on their mobile phone, utilizing the handset’s inherent internet capabilities to do so.
fring sits at the heart of the fringsters™ online communication world allowing the freedom to communicate with all popular communities’ members (Skype®, MSN® Messenger, Google Talk™, ICQ, SIP, Twitter, Yahoo!™, AIM®) without boundaries, and regardless of device, network operator, platform or the community(ies) to which they belong.
The ethos of encouraging freedom and mobility extends to giving fringsters the choice between available connection types (3G, EDGE, GPRS or Wi-Fi) and the enjoyment of fring’s benefits without subscription; fring is totally free to download and free to use – the only cost incurred by the user is the mobile internet connection.
I did use Fring and i find fring very nice and useful . Try today.
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