I recently discovered your web series. Nice.
I would like to note some things though. The volume is sometimes too low; you could speak little louder. Also that it would be nice to add some video clips of that time. Like ads or reports about the then new computer you are reviewing.
For the Sinclair QL you mentioned though it has multitasking. Correct, but it was also the first commercially available computer that had it, predating the Amiga by more than a year.
There is also a nice video I recommend from 1983 or so where a young Bill Gates talks about the MSX computers (did you ever make an episode of these?). And then a quite arrogant Clive Sinclair bitching about Gates and that Sinclair had the UK market on his grasp, with no chance Microsoft could get a larger share. Then he sais it gets even better, since the Sinclair QL was just around the corner. Well that didn't work. But nice witness of time. I could try to locate this video (runs about 20 minutes) if interested.
And for the Osborne. As far as I know they didn't go bust because others had similar devices but with larger screens. Rather than he announced the Executive too early, wasn't able to get it on the shelves, and people canceled Osborne 1 orders. It became to be known as the "Osborne Effect" <http://en.wikipedia.org/wiki/Osborne_effect>