Second generation web apps get smarter!

So we've all heard about how Web 2.0 applications are creeping into the work space but usually under the radar. IT and project managers usually struggle to keep them in compliance and to find a way to get what they want out of product. With certain new web apps however the vendors and developers are getting ahead and finding ways to adapt their products to make them more appealing to the project manager by adding features. Some of these smart designs allow PMs to get a better projection of time lines by allowing more fluid date ranges and "best/worst-case-scenarios". These metrics are more realistic because they mimic real life project management, I know a few project managers who would embrace this idea right away, maybe it's time to upgrade from MS Project?