Did you scrutinize those numbers? Too many numbers, maybe? Sorry about that, if so. So let's tell it with pictures!
Here is the gist ...
Inflation adjusted percentage increase in after-tax household income for the top 1% and the four quintiles, between 1979 and 2005 (gains by top 1% are reflected by bottom bar; bottom quintile by top bar).
... and here is what we're up against:
We have stolen these from Susan of Texas (via TBogg), whose post you should read, because she is looking at McMegan McArdle, who (1) has an inexplicably prominent platform and hence large amount of Authoriteh, and (2) is a big fan of tax cuts, including keeping Bush's tax cuts, because they help her stay rich and innumerate. Or something!