Sweet, I think I do the "storing up for the winter" thing too, except I never order wax in hot weather, so for me, wax "winter" is actually summer, haha.
Well, here's the epic saga of my organizing. During a trip to Target I got some color-coded stickers to permanently keep track of how old my various tarts were. I put my orders into groups for color coding (for example, April/May of 2010 was pink). Pretty soon I figured I could save a lot of stickers and work by just putting the orders into bags within their scent category. So for example, all of my fruity Can-Do's are in one bag with a big green sticker on it. For other tarts I did put a sticker on each one, it just depended on the situation.
The oldest tarts I found included a cinnamon roll scent from Nene's (Nov. 2008) and a couple Everyday Whims ones. I also have a plastic container designated especially for those very oldest ones, since they have to be melted next. (I called them "emergency" tarts, and DH would giggle whenever I said "uh oh, EMERGENCY" and threw a really old one in the bin.) This container also got a lot of my swapped tarts, since I can't look those up and find out how old they are. The tricky part is that the so-called "emergency" container now holds well over a month's worth of tarts.
Now my bakery, fruit, and floral collections are MUCH more organized because vendors are together (this wasn't true previously) and the oldest stuff is on top. I also rearranged my candles on their shelving unit and am much more motivated to use those up. (Got my eye on Pure Integrity for a future restock, but I gotta earn it first.)
I've had great fun doing this and am relieved to have some sense of order in place for future tart selections. It makes me realize what a big stash I've accumulated. Sometime soon I'm going to dive in for some Spotted Hog, but that'll probably be it for a while. Those of you with big stashes, I highly recommend doing this sort of thing to make sure some of your oldest tarts aren't getting overlooked. It feels great to have things more organized. Hooray!!