Bioinformatic tools for micro RNA target prediction - (Sep/10/2011 )

Hi
I am looking for some means to have a hint about the targets of some unknown micro RNAs. Are there any bioinformatic tools that can predict the target of an unknown micro RNA? The micro RNA sequences in my hand are not related to known classes of miRNAs. My experimental organism is Drosophila. Any suggestions will be greatly appreciated

miRanda or targetscan