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If you sometimes go out with the guys and have a little, no quite a lot to drink then this app may be what you need.
Activate it at the beginning of your big night out and it tracks where you've been and who you've called/texted from your phone.
It won't save you from the stupid things you do but it will help you remember them when you just can't remember what you did.
iBlackout for BlackBerry -- $2.99