Wow - looks like Microsoft Research has released a set of Data Visualization Components (scroll down to ‘Data Visualization Components’) for .NET that includes:

• Bubble Chart Generator / Control: a set of points displayed as bubbles in an x-y coordinate system.
  
• Piano Roll Control: a spreadsheet-like display of numerical data. 
  
• Spire Chart Generator / Control: a collection of bubbles. Each bubble has a start date and an upper/lower flag that determine where the bubble is drawn, and a size metric that determines the size of the bubble.
  
• Thread Tree Generator / Control: a hierarchy of nodes with the following characteristics: The tree has one root node, Every node except the root node has a parent node, Every node has zero or more child nodes, Every node except the root node has a metric value that determines its sort order.
  
• Time Series Chart Generator / Control: a time series chart that can display multiple time series, each with its own color and glyph style.
  
• Treemap Generator / Control: a rendering of hierarchical data as a set of nested boxes.

If you remember, a few months ago I was playing around with the Treemap control to do some RSS visualizations.

The other control that I’m particularly interested in is the Thread Tree Control - you’ll remember that from the awesome paper from Gina Vinolia “Understanding Sequence and Reply Relationships within Email Conversations: A Mixed-Model Visualization”. More pictures of the thread tree can be found here.