Well the second round of You Decide events are ongoing in Tower Hamlets. As with any of these things, you have to attend to have your say, and to make sure money is sensibly spent.
To register go to www.towerhamlets.gov.uk/youdecide. I'll be at the Bow (LAP5) meeting on Tuesday 2nd March, which is where I live.
Hopefully the Town Hall have learnt from the mistakes of last time that saw young people having an overwhelming say in the meeting; and also have a better system to ensure that the area eg crime / children services is selected first, and then all residents have a say as to what measure in that area the money should go to.