RIM recently updated BlackBerry Internet Service with new features.
It now allows non-enterprise users to push and check up to ten email addresses. This service is what consumers generally use to get email if they aren't connected to a corporate network using BlackBerry Enterprise Server.
RIM has improved the help screen so that users have the ability to send service books, open the BlackBerry HELP web site on the BlackBerry smartphone, access BlackBerry answers and has contact information for wireless service providers.
Users can use IM services like Yahoo! Messenger, Gtalk, Windows Live Messenger, AOL Instant Messenger and ICQ.
The BlackBerry Internet Service UI is now available in Thai and Indonesian.
Here's the official RIM knowledge base article.