Watch the Flanger After OD online guitar lesson by Jeff McErlain from Guitar Effects Survival Guide
To me the first tune that comes to mind when I think flanger is "Spirit of Radio" by Rush. Flanger, right off the top, thick and full is all its glory. Other famous tunes that use an extreme flange effect Gorilla Radio by Rage Against The Machine, Bold As Love by Hendrix, Nobodies Fault But Mine by Zeppelin, and High Landrons by Eric Johnson. When a modulation effect is placed after overdrive it is accentuated, so if you want an extreme flanged sound, put the unit after the OD.