Introducing Sky in Google Earth - Press Release
Expansion of Google Earth to include views to the sky/space - better 3D.

Top 100 Tools for Learning
important to note that many are not necessarily specific educational tools and that most popular ones are free (9 out of 10, and 16 out of 20). And, web 2.0 dominates the list, though it certainly has bias of technologists and early adopters.