The Summer09 prerelease orgs are here, so get yours now! Upon first look, something cool stood out and merits immediate posting:
Dashboards are improved. The colors are more vivid, there’s detail in the bars and pie chart wedges, and… pie charts can now display the actual and percentage values!
Dashboards are also new. Visualforce pages can now be included as dashboard components, and there’s a new “Color-Blind Palette on Charts” setting for each user. Here are before and after shots.
Image may be NSFW.
Clik here to view.
Clik here to view.

Salesforce dashboard with regular color scheme
Image may be NSFW.
Clik here to view.
Clik here to view.

Salesforce dashboard with color-blind/alternate color scheme