Most of my todo items come to me as emails, so I wanted something that lives within my Gmail. I managed this in three steps... 1/ I created a label called "todo" 2/ I made this a section in my Gmail priority Inbox so it's always displayed 3/ I created a filter to fire on emails sent to [email protected], and label them as todo.

So I can just label an email as todo, or send myself an email to [email protected]