As promised, here are my results running IE9 and the latest Adobe Flash with the Shub using the R30 firmware directly connected in router mode to an Nvidia gigabit wired ethernet card:
So, it looks like it's working very well. I am really waiting for the 12meg upstream though for my NAS. Roll on the next phase!

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It is worth noting that I only have 4 downstream channels. The router has been rebooted since the 100meg upgrade took place. Is this right? Shouldn't I have a few more downstream channels now I'm on 100meg?