Script Summary: Gmail: select only conversations with multiple replies or with Re: in the subject line
I wrote this because I subscribe to many mailing lists and with some of them I only read the messages without any replies. I needed something to select only those that have been replied to so they can be marked as read or deleted.
This script adds two links to the Select: None, All (etc.) list – a Conversations link and a Replies link. Conversations selects items with multiple replies and Replies selects items where the subject line starts with Re: (or re: or RE:).
Update 1 May 2007: Changed it to use XPath, links now stop disappearing when the Inbox automatically refreshes itself.
Update 16 April 2008: It now works in the new Gmail (and it should still work in the old version too).