Free Teacher Resources from Microsoft
Microsoft Mathematics 4.0 – the free tool helps to do the complex graph calculations.
Mouse Mischief – provide option in PowerPoint to have interactive Q&A
Interactive Class room – this is free add-in for PowerPoint and OneNote to have real time polling in the class room presentation.
Photosynth – this tool helps to create 3D-Experience with multiple images.
Songsmith – this tool match your singing voice
much more free tools at http://www.microsoft.com/education/teachers/default.aspx
Credit to Mr.M.S.Anand, who has showcased some of these applications in http://bitpro.in User Group Meet on 18th June 2011.