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http://www.couchbase.com/products-and-services/memcached
This says it all, couchbase includes memcached as part of it, and can operate in "pure memcache" mode or can add persistence and other features behind memcached. Sounds like it'll do what we're after.
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http://www.danga.com/memcached/
memcached is a high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load.
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http://www.digital-web.com/articles/client_side_load_balancing/
An article describing a system that uses client side load balancing in a Web application. Voxlite is the example application built on Amazon EC2 and S3.
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http://www.fabrizio-branca.de/magento-caching-internals.html
Very detailed article explaining how Magento implements its caching mechanism. It seems to be some custom classes layered on top of Zend's caching framework. Useful read.
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http://www.gidnetwork.com/tools/gzip-test.php
Very handy tool that will tell you if gzip or deflate is enabled on a url or not.
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http://www.linux-ha.org/
Linux HA produce the Hearbeat application which is used in high availability clusters.
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http://www.linuxvirtualserver.org/
The Linux Virtual Server as an advanced load balancing solution can be used to build highly scalable and highly available network services, such as scalable web, cache, mail, ftp, media and VoIP services.
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http://www.nbs-system.co.uk/blog-2/magento-optimization-howto-en.html
Very useful article outlining the broad basics of optimising Magento. Includes links to more detailed information and lots of config file examples. Very useful.
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http://www.scalebase.com/
Another cloud based scale solution for MySQL, aims to simplify deploying MySQL "in the cloud".
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http://www.ultramonkey.org/
Ultra Moneky is a load balancer similar to the likes of pound and haproxy. It allows multiple web servers to be seen as 1 by the client.
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http://www.webpop.com/blog/posts/building-a-scalable-cms-on-the-rackspace-cloud
Interesting article on how webpop built their infrastructure on Rackspace's cloud. Includes links to a few useful tools (chef, wormly, new relic, nagios, ganglia, and others).
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http://xeround.com/
Tool that tries to automate the scaling and replication of MySQL database in "the cloud".
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https://beeznest.wordpress.com/2011/04/18/memcached-to-store-php-sessions/
Excellent article describing in depth how to have PHP store session data in memcached and the differences between the memcache and memcached implementations in PHP. Very useful.
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https://github.com/madalinoprea/magneto-varnish/
A magento varnish plugin that enables varnish caching on Magento sites.