The first is Crowdbooster, which is saw at the Eurosurveillance meeting I spoke at last week. Crowdbooster does a number of useful impact-related things, analysing your content to show which items get most takeup. One simple but useful thing it does it to tell you how many of your followers are online at different times of day. For example, in the following image, compare blog one with blog two:
Spot the UK-based 9 to 5ers who read blog one, compared with the more varied distribution for blog two, which gets a lot of views from North America. Methinks I need to work evenings more with blog two. Fortunately, Crowdbooster lets you schedule tweets :-)
The second tool is Infomous, which I have admired for some time - it is used to good effect on The Economist website. Here's a view of this blog:
Other than pure eye candy, I haven't figured out how to make best use of Infomous yet. Is it an probably an improvement on the existing tag cloud in the sidebar of this blog?
I'm sold on the idea that data visualization is an important tool in fighting information overload, but I'm not convinced that most of the tools currently available are as valuable as high quality curation.