3x5 Index Cards... I buy 100 packs of 100 index cards every year around this time. During the back to school sales they cost around $0.44/ea. I use these for EVERYTHING. I have a note card for anything you can think of, lol.
Todoist -
http://www.todoist.com I couldn't live without this. I use it for my daily tasks, bill reminders, projects, ect.
My big ass dry erase board hanging in my office. It's also magnetic so that works out well too.
Thunderbird for email and contacts. Gmail likewise.
Cellphone for alarms but I never use the calendar on it.
A wall calendar for misc things.