Gmail has officially integrated several of our favourite Labs-only features into Gmail proper, including previously mentioned features like search autocomplete, Go to Label (one of the biggies in my Gmail master redux), forgotten attachment detector, YouTube previews, and more.
Search autocomplete automatically suggests search criteria based on common searches; Go to Label adds excellent keyboard shortcuts for navigating your account (type 'g' + 'label name'); forgotten attachment detector alerts you before you send an attachment-less message; YouTube preview, like it sounds, lets you watch linked videos inside Gmail without opening a new window; custom label colours lets you set any colour to any label; and the vacation dates feature lets you set the dates you'll be away so your auto-responders don't go out before or after your vacation begins or ends.
On the flip side, Gmail also retired five less popular features: Muzzle, Fixed Width Font, Email Addict, Location in Signature, and Random Signature.
Got another Labs feature you'd like to see graduate Labs and join the default Gmail feature set? Got one you'd like to see retired? Let's hear it in the comments.
Gmail Labs graduation and retirement [Official Gmail Blog]