The leaders of this rally from march-09, have been top companies from auto and it sector,as one can see from charts posted here, these two sectors were laggards of 2006-2008 huge euphoric rally in sensex-nifty.
As against that rally, these two sectors are the leaders of the current bull-run.
Now, as charts suggests, there are some stocks in these sectors, that have started to show, some weakness,its still no CONFIRMATION, yet, but initial weakness is coming up.