Google has announced integration of analytics into webmaster tools after a a 4 month pilot test program. The process is achieved by linking your analytics account to your webmaster tools account for the same domain(s).
Since the pilot Google has been busy perfecting the tool and it now deems it ready for public use.
The tool extracts data from two sets and ingrates it to bring more detailed reports.
For queries data you get number of impressions, clicks, organic position of keyword and click through rate (CTR) for the top 1,000 query phrases.
For landing pages you will also be able to see number of impressions and clicks, organic position of keywords and CTR for the top 1,000 landing pages.
This is a free tool which combines two sets of data from the two free programs that are highly recommended for data analysis. You can sign up to Google webmaster tool here and Analytics tool here. Combining the two is easy using Google instructions.
I have wondered many a times why I need to download both sets of data sepratly and and try to somehow reconcile searches keywords with impressions and organic rankings data. Now with this there is no need to mess about with excel spreadsheets with the the data in one place.
You will be able to see the success of your SEO efforts by seeing increasing or decreasing in average ranking position and relating it to visitor numbers. With Google Analytics in Webmaster tools an SEO services consultant will easily show their client change in visibility, impressions and clicks to justify their work and ROI given average margins for the product or service.