Question
I am going to invest in some normal old fashioned seeds that can be saved year to year. How do I save them?

I like in minnesota where the growing season is June to August or May to Aug at best.

What do you reccomend that I grow? I live in an apartment and I want to grow everything on my north facing balcony. I had some luck another year on my south east facing balcony with tomatoes, but I need something that is eatable in a short growing season and something that really can handle non-sun exposure.

Also, I am assuming that this will be another hot summer, as we've had unseasonable high temperatures like 70 in april and 60 in march. So for the summer, it may be 80 degrees or 90 for week-two week stretches.

Answer
Deri:
First of all, do you mean saving the seeds from the original packet (I assume you won't need all of them this year), or harvesting seeds from what you grow?

As for growing on the north side of your apt, you will be limited. I would suggest salad greens, such as lettuce and spinach, but they don't like heat. You can find some varieties of both that are "slow bolt", and "non-bitter", meaning they won't flower as quickly or turn bitter (lettuce) in the heat. They will also be ready to harvest quickly. You can try peas as well, there are some newer varieties that have been developed for pots, but any of them will do. They actually work well in hanging baskets, since the vines can just hang down instead or growing up.