From the modern line, I won one of those Toy Fair vac-metalized Vaders, and a cinema cast vader coming down the stairs, from the Jedi point auctions. As much as I love kubricks right now, I think those two vaders would be the last thing I would let go.
From the vintage line, I still have my AT-AT with its' empire box, and a dewback I got as a christmas present when I was about 8. Those I consider priceless.
I'll post for my daugters- With the release of ROTS, there were a ton of mail away items for food companies. My 8 and 5 year old went nuts when we came home one day and there were 3 packages for them with the cookie jars from Kellogs. They still talk about it like it was yesterday, and they still use their lightsaber spoons.
I'm a big fan of companies doing mail-away and other reward type programs. My biggest pet peeve right now is chase figures and the impending Hasbro experiment with that same idea. A mail away will reward people who buy and open figures (I know these offers are tough on MOC collectors). A chase figures says "Hey, speculators and scalpers! Over Here! Come make 5 extra dollars and still not have to take a bath!" Creating a false sense of worth to infuse the hobby with excitement, well, I'm against it. The mail away offer for George Storm sounds like a Scalpers wet dream. They can hold specific figures hostage that collectors need to get their mail away. Ugg. Here's hoping my visions don't come to pass...