Just press Shift+Y and mark all unread entries upto the current entry as read in Google Reader, Shift+I for all entries below the current entry.

Adds a "Mark Read" or "Mark Unread" button to Gmail pages (active only when mail items are selected).

Press 'b' to open item in a new tab (when collapsed). Press 'Enter' to open item in a new tab and collapse it (when expanded). Always marks item read when you press 'b' or 's' (for the purpose of counting it in Trends as read).

Adds a "Mark Read" or "Mark Unread" button to Gmail pages (active only when mail items are selected). This version fixes all wrapping issues, and allows to work even on GMail for Domains.

Fix the low contrast hard to read styles and fonts of siliconinvestor.com

highlight the current paragraph to read more clearly

Script adds a 'Mark Read/Mark Unread' ping-pong button that updates the states itself. If the checked item are all read ones, the button shows 'Mark Unread', otherwise it is 'Mark Read'. This scripts was based on code of 'GMail Smart-Delete Button...