Homebuilders have been on an unbelievably big run. Looking at two relevant ETFs, we can see that one is at prior highs, while the other broke out to fresh new highs. Let's start there. XHB was recently at a prior high, and the ITB made newer highs. Amazingly, XHB -- the homebuilders ETF -- got within 0.01 cent of the prior high, then pulled back below the 10-week moving average on Thursday.