If you spend more time in Gmail than Facebook, MySpace, or LinkedIn, but still want to know what your contacts on those social networks are up to, NutshellMail
can help. When you sign up for a free account, you can associate it with your account on various social networking sites, and then you can designate how frequently you want to receive updates. Want to know if you've received new friend requests, group invitations, or if your friends birthdays are coming up? NutshellMail can shoot you an email with that information every hour, once a week, or anywhere in between.
You can also use NutShellMail to connect your email accounts. For example, you can have the service forward a list of messages in your Gmail inbox to your work email address every few hours if you want to keep up with your Gmail while you're at work without actually logging into Gmail.