I got the idea from Carol of May Dreams to keep an inventory of seeds on a spread sheet. It was such a great idea, I didn't even procrastinate but started right in on it.
Here are my headings:
3. Date (on packet if purchased, or when given if a gift)
4. Date Planted
5. Germination (% germination)
6. Comments - this includes how well the seeds grew, whether the plants were as the seed producer advertised, whether the plants were uniform, etc. It also includes where the seeds are stored. Since I lived in two different places, I sometimes have trouble remembering where I've put a packet or jar of seeds (I keep saved seeds in various recycled containers).