What seo tool is your favorite?

Hi)
i want to ask you wat seo tool is your favorite and why?
i like forum posting most of all, coz i like to talk with different people and from forums i know so many useful things!)
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I like Google Webmaster Tool for my purpose.I think Forum posting is a technique of link building.

Please dont use tools, you can build the link manually...

I like and I use Google Analytics a lot and I think that this is the perfect tool for SEO.

Google webmaster tool is great..it provides all relevant info for seo purposes..

Google have so many good tools, but I like the most Google analytics, seoquake, adwords keyword tool and wordtracker.

Although I use many tools and plugins, but my favorite are the foxy proxy and the seo quake. These are so easy and versatile plugins of mozilla firefox.

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I tried many of the SEO Tools during my work.However my favorites are:
Link Popularity
Enter a valid URL, and this tool will query all the major search engines (Google, Yahoo, MSN, and Teoma) and then return that URL's total link count for each one
Google Search for Multiple Datacenter
This tool searches your keyword/phrase in different Google data centers.
AdSense Preview
This preview utility will give you a sense of which ads would be placed on a given page.

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The articles post on the site is really helpful, thanks for sharing the knowledge .

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I also use many of them tools...

But the Google Analytics is my favorite...

we like seo quake toolbar . this is very useful for us

I like Google webmaster tool and I always used Google webmaster tool.

I like google analytics tool.