If you have clients or online projects you partner on, then using an online project organizing software is essential. I personally use Client Spot to stay organized with tasks to complete, time used on tasks and projects, shared files and emails.

I put my virtual assistant clients work in their own projects and also put up the work on my sites. Then when I want my VA to jump in on an assignment I just click her as the assigned person and it sends her an email.  Staying organized means getting more done.