Gmail

gives you the live Gmail experience on your Java-enabled mobile phone. Version 1.5 adds the ability to search your mail, easy access to your contacts list, more efficient data usage that reduces bandwidth consumption (and load time), and more configurable settings. The downsides: 1.5 still doesn't support Google Apps for Your Domain, and by default it adds a hideous "Sent from Gmail for mobile" to your sent messages

                                                              DOWNLOAD