Now I want some UNHEALTHY recipes too. I'd love to send my boyfriend some baked treats and I wonder what other people have sent and how its shelf life worked out.

I love to send cakes in jars to people. I have my own follow-my-nose method, but for a better idea, here's the Kitchn entry on the matter:
http://www.thekitchn.com/thekitchn/sweet-idea-cake-in-a-jar-ungift-guide-2008-072631
Healthy? Not usually. But breads like zucchini or banana bread work very well, so you can play around with your favorite recipes.

Being a college student, I enjoy cranberries, cookies, and coupons. Cranberries are a delicious silent treat we students can eat anywhere. Cookies are good motivation for homework. Coupons help out tremendously in our low income and time.

I was the last of my friends to go off to college, and I remember mailing off a lot of cookies in the month I was still home. I have to say, I always figured that sending unhealthy treats was okay, since it encouraged sharing! Here are the blondies I sometimes send to my sister, who's still at college. I also do send her quickbreads, such as carrot, zucchini, or apple, but I bake them in muffin tins.

The granola bars Smitten Kitchen made recently look divine, and no added fat! You could even throw some chocolate chips in part of them to make them a bit more decadent but still healthy!

http://smittenkitchen.com/2009/09/granola-bars/

I've mailed jam to friends across the country without misshap, so I would definitely vote for that if you jam and can. Oatmeal cookies made with whole wheat flour and reduced sugar still taste great and also are reasonably sturdy, too.

101 Cookbooks blog has a yummy recipe for Big Sur Powerbars.

Another idea is you could make your own trailmix combinations. That's something easy to toss in your bookbag and sneak into the library or eat between back to back classes when you can't squeaze in a meal.

Biscotti ship pretty well, and are delicious.