I am a minimalist when it comes to my email set up, however I have enabled a number of labs to improve the functionality of my Gmail experience. First I have enabled most of the labs for viewing PDF's and other documents directly in Gmail. I have also enabled signature tweaks, translate message, send and archive, drag and drop, POP mail fetch and nested labels.
You can turn this features on and off through the LABS page in settings or from the beaker symbol in the webpage header.
I have also enabled my Google Apps for Offline working. I use a laptop as my primary machine and I find that sometimes I need to work where I do not have a connection to the internet. The Offline mode allows me to work with both Gmail and Calendar when not connected. Once connected all changes are sync'ed with the web versions of Gmail and Calendar. This is very convenient for air travel or when you are in a location that doesn't offer free wifi. Offline mode was also available for Google Doc's however with the new implementation of HTML 5 for some of the Doc's applications offline mode is not available for editing of documents when not connected to the internet. Google is working on bringing back the offline function for Google Docs very soon. As I mentioned in an earlier post I use Microsoft Office for most of my document creation and editing functions.
The bottom line is that users will be able to customize there experience with Google Apps through the use of Google LABS.
