On the members site there is ongoing discussion on potential candidates
One of the systematic way to find stocks likely to double is by running couple of growth screens.
Extreme Growth Screen
Avg eps % growth last 2 quarters >= 100
Avg sales growth last two quarters>=50%
Price within 25% of 52 week high
Growth Acceleration Screen
5 year avg eps growth>50
2 qtr avg eps growth>=100
price within 25% of 52 week high.
avg 5 year eps growth 15 to 25%
last 2 qtr eps growth>100%
price within 25% of 52 week high
The screens give you potential candidate. After that you have to look for one which has not run to much and is just beginning the move...
The screens will capture many but not all stocks likely to double. Simple momentum screen will capture almost every stock that doubles.