Have you been wanting to experiment with synchronous technologies, but been held back by the cost of the soultions available?  Here is a chance to really test out its possibilities are for free. Elluminate is offering any K-12 academic institution free, unlimited access of Elluminate Live! Lite Edition for one year.  This is one of the foremost solutions available for synchronous communications in a school setting.  While not all of their features are available on the Lite version, it will definitely give you a change to test things out. Here is a link to more informationon the offering. 

They also offer a more full featured meeting room with the limitation of 3 people, again for free. This is their VRoom product, and more information can be found here.