For those of you not on Bill St Arnaud's mailing list, here is a link to a GEM of an article originally posted on enterprisenetworksandservers.com.  It highlights the cost-effective potential for deploying fibre within your organisation beyond the core.

http://lists.canarie.ca/pipermail/news/2006/000359.html 

As we saw in the KAREN proof-of-concept, internal networks can be a bottleneck to delivering KAREN speeds reliably to key groups of users.  And upgrading an entire infrastructure may not be an option!  Some of the options outlined in the article may be of interest to members thinking through how best to promulgate their KAREN connection internally.