There are at least two papers in volume 782 of Methods in Molecular Biology that may be relevant to cell-based Drosophila RNAi screening:
Davidson JM, Duronio RJ. (2011) Using Drosophila S2 Cells to Measure S phase-Coupled Protein Destruction via Flow Cytometry. Methods Mol Biol. 782:205-219. PMID: 21870294.
Siudeja K, de Jong J, Sibon OC. (2011) Studying Cell Cycle Checkpoints Using Drosophila Cultured Cells. Methods Mol Biol. 782:59-73. PMID: 21870285.