I'm new to the VA biz...sort of.

I had a single client for about 1.5 years, but chose to move on from that client and try to obtain several other clients who required fewer hours weekly (and could pay more!).
Anyway, long story short (too late) - I've found that I am inundated with emails from the couple of clients that I have! They use email to send requests to me (which is obviously preferable as opposed to telephone) and I find that I am constantly buried under tons of email! I've recently started using Google's To Do list feature (I use gmail) and it has helped some, but I still am not crazy about my system.
I imagine this is not a unique problem - what do you do to keep track of emails/priorities, etc.?
Thanks!!