The freebie: NutshellMail
A free e-mail based tool from Nutshell Mail Inc., NutshellMail gathers information on all the activities and messages taking place through your various social networking accounts and delivers it to you in a single e-mail. You can also engage in activities - such as posting a comment on Facebook or sending a DM on Twitter - through the e-mail itself. NutshellMail allows you to select what type of information you want included in the report, how many times a day you want to receive it and what time of day you want it delivered to your inbox. The service currently supports Facebook, Twitter, LinkedIn and MySpace.