All the time.
I pick up scents that remind me of various teachers in elementary school, setting up a tent at girls camp, catching tadpoles (it's something in the mud... I know it's something in the stinky mud there), Summer near a pear tree where all the yellow jackets were, the carpet in my friend's house when I was like 8, a certain My Little Pony scent (yes, I had a scented one o_O) takes me back to a whole lot of associated memories, and the smell of lots of other people and their houses. I remember the scent of the house of a certain family, and the memories of basically everything I did in that house or with that family rushes back. BOOM. Like that.
And it's really amazing how suddenly the memories relating to the subject or scene just hit ya.
I read somewhere (yeah, here I go, not giving sources and adding to the already rampant hearsay ane rumors on the Internet.
) that smells don't have to go through the same memory-setting process as visual, auditory, etc cues. I heard they go straight to long-term and they are remembered dfferently somehow.
So... scents are remembered differnetly than how you remember your neighbor's name. Not like a piece of information, but as an unconscious background to other memories... or something. <_<
Regardless of how accurate that is, scents do seem to have more associations in memory and seem get the brain to give them up a lot more easily.