I overwinter a lot of succulents indoors: agaves, aloes, euphorbias, cactus, and most of them are quite easy as long as they get a little light and are kept relatively dry.
Echeveria too -- I had taken their ease of overwintering for granted until a comment by Loree in her post today saying that her echeveria never last the winter indoors. Strange, because this one I have is so easy!
It doesn't even require too much light, although I have some under bright fluorescents (seen above), but some are in the garage where they get just dim fluorescent lighting -- plant near the ground, light fixture up near ceiling:
Even the ones in the terrarium thrive, whether or not they're getting full light...
...or are shadowed by the other plants:
Sure, those shaded ones are not big and happy, but they make great propagation stock for next spring and will turn into the bigger, fuller versions (like their parent) by the middle of summer.
So what's your experience with these -- are they easy to overwinter indoors for you, or do I just happen to have one of the less fussy ones?
Incidentally, I left one of these outdoors in one of the big deck planters. Yes it had a little bit of ornamental grass covering it, but after the 19ºF (-7ºC) night it appears to be unfdamaged. How cold-hardy are these things?