we have our 'local channel' which amounts to a video blog, sometimes the programs are realy good, but they are prone to leaving a pc running looped programs over the weekend - many a BSOD instead of 'normal service'
I can't see video blogs taking off over here while upload speeds are relatively low. Getting standards sorted could be a pain too - that one used quicktime, which some people don't like - although I personally prefer anything to RealPlayer.
Also I wonder what the legal situation is - I'm assuming you would have to have anyone else you filmed give permission for it to be published.??