Ever since he came back from his 3 game suspension, for arguing with an Ump, he has been red hot. In the 5 games since, look at these numbers:
11 for 19, 5 runs - 2 hr's - 8 rbi's - 4 sb's (2BB/3K ratio)
The AVG. or power isn't what has surprised me this year though, it's his speed on the base paths. When I saw him in ST I knew he looked pretty fast, but man ... 13 SB's for the year now (only caught twice). Hopefully this will stop all the comparisons to his brother about getting to big.