follow.it - follow.it gets publishers more followers & recurring traffic, and provides a better reading experience for followers
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Feedly - The content you need to accelerate your research, marketing, and sales.
Feedio - Feedio helps bloggers manage and grow their email and RSS subscribers.
FeedWind - FeedWind is the world's leading RSS widget, Facebook widget and Google Calendar widget - works on any website and is fully customizable
GetResponse - Email marketing from GetResponse. Send email newsletters, campaigns, online surveys and follow-up autoresponders. Simple, easy interface. FREE sign up.