Google Labs proposes features that are not officially part of Gmail but can be really usefull to improve user experience.
The latest, auto-advance, is fixing something that is really annoying when you want to clean your mailbox when coming back from holidays or seminars or having let the Inbox grow too much.
It's called Auto-Advance. It allows to open directly next (older or newer - depending on your preferences) unread email when clicking Delete or Archive on the current one.
To set it up, go to the Labs features (small green pipette or click here) and search for Auto-Advance text in the page to Enable it.
As I already wrote in this blog, you can also turn off the "conversation" views, somezthing that was confusing for people coming from Lotus Notes.
Target : gmail ninjas
If you did not already activated it, there is still a link on the top right of your screen requesting that you test the new Priority Inbox, a convenient way to read quickly only emails that are important to you.
Mastering the features require more than just 2 minutes, as it improves over time and help you determine what is important for you or not.
It basically reorganize your mailbox in 3 sections:
An email is tagged important either by you, either by Gmail you tries to learn from your reading habits.