My latest must see is TWiT. It is a streaming online Tech tv service that has shows screened throughout the day and then replayed around the live broadcast times.
For the broadcasts I have seen, they are, for the most part, well presented and produced pieces. With a variety of themes around technology there is a good range to keep techheads up to date with whats happening.
For me the ones I return to are TNT with Tom Merritt, All about Android and The Week in Google
All have one or more main presenters usually with guests beamed in to the show by video.
There seems to be good banter between the hosts and guests which makes for a much more watchable experience.
Go and have a look for yourself.