BlogPulse offers a trend search very similar to Google Trends but specifically targeted at blogs.
Here is the blog trend for the words Joomla, Drupal and Wordpress over the last 6 months.
This shows the percentage of the mentions of each word, Joomla, Drupal and Wordpress in blogs.
Just came across Lively.com which developed by Google, creates a virtual 3D world similar to SecondLife.
I haven't tested out Lively yet, since I'm running Ubuntu and it only supports Windows at the moment. In one of their blog posts however we can gather that Lively is well integrated with the Web. They have widgets that allows visitors - with Lively software installed - to jump into a Lively room embedded in a webpage.
By contrast I believe SecondLife offer APIs that offers a REST interface as well as other network level interfacing. Here is a SecondLife Facebook Application.
I'm wondering if Google will offer the same level of integration with their Lively 3D world. Would make fun Mashups.
