Tips for Gmail users

If you're a Google Gmail user - and who isn't? - Lifehacker has a list of 10 features developed in Gmail labs that you might fine useful. A couple that appeal to me are multiple inboxes allowing you to filter your mail into several "buckets", Canned Responses that let you set up canned replies so you can quickly and easily fire off that same old reply, and my favorite, Forgotten Attachment Detector, which scans your email to determine whether or not you had meant to attach a file and alerts you if an attachment is missing (how many times have I done that?).