One of my web developer friends evolved her own custom CMS several years ago, when there the opensource CMS’s (a la Drupal, Joomla, et al) were not nearly as good as they are now. In the past few years many of her clients have wanted to start blogs. Writing her own blogging module seemed a bit silly in this day and age when there is so much free blogging software available. She considered what a lot of site owners do– installing a wordpress and hooking it to either a subdomain or a subdirectory of the main client site, but it was not her choice, mainly because if you self-host a wordpress you have to maintain and update it, and most of her clients were not willing to foot the bill for their own private hosted wordpress. She might have minimized their cost if she had them all running blogs out of a single wordpress install, but I do not think she considered wordpress mu, or doing what I have done, which is essentially my own homespun mu setup done with symlinks. Her solution was to use Blogger!
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It is a very good idea, and often overlooked, to 
