Gmail feature you just can't live without.
tralfam: Spam filter. Gmail has blocked 2000 spam in the last 30 days. Spam almost never makes it past that filter.Second is the ability to easily manipulate large amounts of email. I mean, easily archive, make read, etc. any amount of email through search. I like to see when people follow me on twitter via email. I get an email everytime, which means there is a ton of email that I want to only look at once. Gmail allows me to go: Search:"Twitter", then "Select All", Archive. Now all that is out of my inbox.