Inception
Ok, so, it's a wonderful movie. But you knew that, because it's what everyone's been saying...which is why I went to see it (finally).
Here's my non-spolier synopsis:
Christopher Nolan watched "Ocean's Eleven" and thought "Huh...that was pretty cool, but I bet I could do it in four dimensions with toroidal wrap-around..."
And so he did. The End.
Alternatively, he watched "What Dreams May Come" and thought "Hmmm...there are ways that that could have sucked less..."
EDIT: also, if you plan on seeing La Vie en Rose, do that BEFORE you see Inception...Marrion Cotillard is freaking terrifying as a "restless ghost" monster type, and I doubt I can ever look at her the same way again.