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http://onlinestatbook.com/2/index.html
Useful online book on statistics. A work in progress, but looks very valuable.
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http://20bits.com/article/statistical-analysis-and-ab-testing
A good introduction to the statistics math of split testing.
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http://abtester.com/calculator/
Includes the math behind the calculation, and sample PHP code to actually generate the numbers. Very cool.
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http://blog.asmartbear.com/easy-statistics-for-adwords-ab-testing-and-hamsters.html
Simple formula to calculate statistical significance at 95% on AB / split tests. N = total clicks, D = diff between win & lose, if D² > N, it's statistically significant. Example, 14 clicks A, 22 clicks B, N=36, D=22-14=8, 8²=64>36, win. If 2D²>N, 99%.
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http://square.github.com/cube/
Cube is an open-source system for visualizing time series data, built on MongoDB, Node and D3.
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http://www.strangeloopnetworks.com/
In a similar vein to cloudflare / yottaa, strangeloop offer a performance enhancement service through a physical / cloud based appliance. It uses the standard techniques, js/css combining, sprites, cdn, tailoring to the browser, and so on. No pricing. :-(
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http://www.yottaa.com/
Similar to CloudFlare but more expensive ($30/mth no ssl, $130/mth with ssl) it accelerates web sites through the use of CDN, js/css combining, etc.
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https://www.cloudflare.com/
loudFlare is an automated CDN / content acceleration type service. It acts as a reverse proxy providing some sort of heuristic security scanning, logging of traffic, and an automatically configured CDN. $15 + $5/site/month.
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http://mixpanel.com/
Web action analytics. Tracks events rather than pageviews, so users clicking "Like", etc. All data in real time, detailed analysis, retained >3yrs. Pricing is free up to 25k data points, $150 for 500k, and upwards. Interesting.
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http://toutapp.com/
Tools to automate and track the success of repetitive emails. Insteads of copying / pasting the same pitches in email, use tout and track response, opens, clicks, etc on all the different templates. $30/month for 1 user, $50 for 3, $100 for 10.
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http://newrelic.com/
A system to monitor multiple aspects of a live application in production including the page load times, server load times, mysql response times, javascript render times, and so on. Expensive.
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http://www.woopra.com/
Woopra is a free web analytics tool with a focus on real time analytics. Track visitors live, even talk to them in real time.
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http://crazyegg.com/
Crazy Egg adds a new dimension to analytics. It includes a heatmap where you can see where users are clicking on the screen, and other visual presentation tools. From $10 for 10 pages (10k pageviews), up to $100 for 100 pages (100k pageviews).
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http://piwik.org/
Piwik is an open source alternative to Google Analytics. It uses the same type of javascript tracking, but is self hosted. It also has an extensive plugin architecture, so you can add / remove features fairly easily.
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http://getclicky.com/
Web Analytics system similar to Google Analytics that supports live "spy" view that shows page views as they happen.
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http://www.openwebanalytics.com/
An open source web analytics framework with in-built integration for WordPress and MediaWiki.
