Gmail for business: 25GB storage, less spam, and a 99% uptime SLA, and enhanced email security.
Google Calendar: Agenda management, scheduling, shared online calendars and mobile sync.
Google Docs: Documents, spreadsheets, and presentations.
Google Groups: User-created groups providing mailing lists, easy content sharing, searchable archives
Google Sites: Secure, coding-free web pages fore intranets and team managed sites.
Google Video: Private, secure, hosted video sharing.