metaflanger is the most fantastic plugin ever. not because it's the most exciting, but because it's just dead handy. i mean we use it to flange things and chorus things sometimes, but there are better chorus units out there, but you can press the stop button and use it to make an acoustic guitar sound wide with a 10ms delay, or you can use it to make a hi-hat nice and stereo, just fiddle with the depth till the tone sounds the same in mono and stereo, or you can use it to make things rattle around like they are in a baked bean can (set the depth to 0 use a long delay time and some feedback then automate the depth to 100 at a point in the track) ...

you can use it to subtley push things back in the mix or to put a really nasty evil eq/fixed flange effect on say a short hi-hat to bring it right up in your face.

it's fantastic! shame the chorus ain't great really!