Nice overview from Robin Good on the differences between IPTV and Internet TV. That Allaire fellow he keeps quoting is certainly a good source of pithy insight.
The choice, for those who can see it, appears to be between a universe of highly diversified and dynamic independent production and one dominated by secure dedicated private delivery networks distributing more traditional types of video-based content largely provided by Hollywood and other established big media conglomerates.
IPTV is represented by a profile of closed, proprietary TV systems such as those present today on cable services but delivered via IP-based secure channels representing a sharp increase in control of content distribution.
Internet Television is instead an open evolving framework in which a very large number of small and medium-sized video producers contribute highly innovative niche content alongside with offerings from more traditional retail and distribution channels.
Nonetheless key differences, being able to appreciate the true nature of these two models remains a challenging task for the uninitiated reader unless she starts to look a little deeper into the differentiating details.