I have taken "Inbox Zero" to heart. If you haven't heard about inbox zero, do a google for it. It is a methodology for taking back your life from your inbox.
I actually started doing this about a week ago. This is what I'm doing.

1. Check work email Once per hour, closing down the email client at the end of the check. Spending no more than 10 mins responding or actioning any new emails that have come in.

2. Check private email Once per day, and will push this out to once per 2 days. Spending no more than 30 mins responding or actioning.

I have already applied this philosophy to my mobile phone.

1. On the weekends I turn off the phone. I check it for messages once per day if I'm within range.

2. After hours I turn off the phone and check for messages the following day.

3. During work hours I don't carry the phone around with me, but check for new messages every couple of hours. I will turn off the 'New Message' notification in a week or so.

4. If it rings I'll answer it.

It is amazing how much extra work you manage to get done when you're not constantly scanning for email or phone messages. Technology is supposed to make our lives easier and simpler.. but we really just end up waiting for the next message/phone call/event.

Give it a go, get your life back.