WorthPoint MySQL SOLR memcached squid

WorthPoint is planning for significent traffic growth in the second half of the year, and we're working on issues on multiple fronts. We have a high level presentation of what we're doing posted to slideshare.net:

http://www.worthpoint.com/blog-entry/draft-presentation-about-scaling-wo...

Your thoughts on what we're doing, esp. anything we missed, would be greatly appreciated!

Thanks!