BlogShares has changed their graphing, but is still using PHP...
BlogShares is a project that I'd love to tackle in switching over to an ASP .NET site. They are racked constantly with visitors, they have some fairly detailed view screens, they are constantly aggregating and changing data, and constantly pulling from a large listing of RSS feeds. Recently they've added some graphs that look better and they've been adding some new game rules and such. The site is a behemoth of possible performance improvements and features.
Looking at their graphs, they probably haven't seen Dundas Charts or any of the really nice graph facilities available to .NET programmers. I hate to say it, but if our graphs went to the same school as their graphs, we'd definitely tease them in the lunch room. I'm thinking performance must be a really large goal for the charting, but I wouldn't foresee any problems making both high quality, high performance charts.
Anyway, if you haven't checked out BlogShares, you shold go check it out. A kind of fantasy stock market in blogs. I've been a member for a while, but all I do is insider trade with my own blog as time permits.