Even though a "virtual" assistant does most of their work online, part of your organization methods may include a paper day-planner.
If it does, check out
DIY (Do It Yourself) Planner where you can download pages for your planner. You can find the basic ones, some very specific ones, some just for fun, and some that you can customize. (There's a marketing idea....find a calendar that you can customize with your logo and give that to clients to use in their own planners.
And if you're inclined and motivated enough to create one of your own specifically geared towards VAs, make sure you share it with us!