There are functional and practical at-the-bench connections between RNAi as a technique and the biology of miRNAs. So I try to keep aware of what's happening in the miRNA world, particularly when it comes to new tools. The DRSC makes some miRNA reagents available (e.g. UAS-miRNAs) and miRNA resource collections have been published by various groups. This report describes a new set of tools for interrogating miRNA function.
Schertel1 et al. (2012) in Genetics. Functional Characterization of Drosophila microRNAs by a Novel in vivo Library. The PubMed citation was not available at the time of this posting. This link should take you to the relevant page at Genetics.