I keep seeing it pop up when researching and wanted to hear from other gardener's about how they manage their garden information. Pen and notebook? Special designs? Online?
Personally, I've never kept anything previously so each year will be a semi-fresh start and daily online searches to find solutions. This year I hope to at least write stuff down; seeds we have, easiest plants to collect seeds from, best/worst companions, harvest time/sprout time, and disease/pest prevention methods.