After attending the Next Web 2008 event, I've had a chance to use Zemanta. It's essentially a blog writing assistant delivered as FireFox plugin. It analyses the text of your post using proprietary natural language algorithms and then provides selections of images, links (articles, wiki references) and tags to use in your post.
The algorithms attempt to accurately match these references to the text of the post, in a highly relevant way. I met the principals in London a few weeks ago, and again at the NextWeb conference. It's actually quite useful, mainly by reducing the time to add tags and copy/paste links.
The software works by parsing around 900 'A' list blog feeds and 300 news and information sources but hasn't quite got the breadth of content to support more specialist subjects. My guess is that more sources will be added over time and the algorithms will become more semantically sound. But even now this is a useful tool particularly for new bloggers and even digital biographers. David Pretherick is an emerging class of writer/service provider that manages his clients' online profiles in a number of different ways, and he does it rather well. For example, optimising LinkedIn profiles by making them easier to read, ensuring consistency and accurate provenance across other platform profiles, teaching people how to use and exploit the information and connections in social networks. So I wonder if Zemanta could be his dream tool for enriching clients' online presence? Zemanta currently supports the three major blogging platforms, WordPress, Typepad, and Blogger.
Custom versions can be created for other platforms via an API and so even smaller communities would find this tool useful for their members. It is at this time completely free.
The business model is a little unclear (maybe like SnapShots with ads?). But hey, critical mass first, and work out the angles later!