Summary - 1)Use of eDry Erase Board 2) Tablet PC Alternative 3) Web Application that incorporates common Social Media 4) Privacy Issues to Avoid  --Sorry for such a long description
 In the past ten years, I’ve used electric dry erase boards but they were never very practical and later I found out that costs were commonly $3-10K (higher priced models include projector and other accessories). For common classroom activities/lectures, it did not make sense to spend that much money.Â
A better use of this particular technology would be to allow for two way communication between two boards that are online (maybe this already exists). For example if a project team was assembled with members from different schools (a potential social media experiment) the members could communicate with each other live in such a way that there was streaming information about what was being written such that the two boards acted as one common board. This tool combined with instant messenger and/or a microphone could allow for a better long distance method of communicating. This would be a potential use for this technology that would bridge a gap. Otherwise I like just plain dry erase boards (essentially no annual costs).
 An alternative to this and a better use of technology for general class note duplication and presentation would be to use something like a Dell Latitude XT2 tablet PC and hook it to a projector. This would be the most direct way of using an interactive display. The cost would be about the same (both about $2,000 without projector). The idea of long distance networking could still be done with this idea by just using NetMeeting (aka Meeting Space) but an intermediate interface would be better for privacy concerns.
 The tablet PC would be very transportable and teachers could use it from home if contacted by a student for help. A website that acts as an interface for live tablet feeds and a storage area of the help provided would be great. This would truly decrease knowledge gaps and communication problems. It’s like an academic Help Desk. It’s not quite Web 2.0 but it utilizes fast response, customized response, and mass distribution.Â
Add instant messaging and/or skype like technology and you would have an advanced form of a webinar with more interaction and less time to setup. Social media like Facebook and Twitter could be used to notify people when key events or current events are occurring, but Facebook/etc would not be directly involved with the academic portion. American Chemistry Society advertises their webinars/webcasts via social media but keeps their business details separate from the social websites.
A feature that many students would want to add to this type of website would be a facebook like personal page where messages can be sent and information can be shared. The teachers would want the courses to be set up like fan pages and the school itself could have its own page sharing information about its operations and events. See my post about Facebook to see my opinion about its flaw/inconvenience.
 I intentionally left out anything about cams and granting access to a computer (except NetMeeting) because I find those to be potential problematic areas. Providing interactive boards online would be a nice addition (even users without touch screens could use that idea but it would be more burdensome)