Always happy to see more people taking Microsoft kit and extending it. In thise case Mike Fourie has created a new project up at CodePlex which aims to create a definitive list of MSBuild extensions. This is a consolidation of the effort from FreeToDev MSBuild Tasks Suite and SDC Tasks Library.
Since I’m more about users getting their stuff done rather than randomly supporting a new project, I think you should also check out the MSBuild Community Tasks project over at Tigris.org. If you are like me you’ll probably end up using both at various times.
Good to see more innovation!