The version also allows you to search your mail and offers more configurable settings. It's reported to reduce bandwidth consumption too – 1.5 actually shows your bandwidth usage whenever it loads data.

One annoyance noted with 1.5 users so far is an advertisement -- “sent from Gmail for mobile” -- tacked onto the end of sent messages. Although, it should be noted, the promo can be disabled in the 1.5 settings. The Gmail Mobile version 1.5 is available in Englih only and is not compatible with Google Apps.