While working on a GMail issue I wrote this little bookmarklet for showing the details of GMail's keyboard mapping:
Tomorrow it will probably be called something else than "Qj" but today it printed out this little list in the console:
gc:GO_CONTACTS gd:GO_DRAFTS ga:GO_ALL *n:SELECT_NONE *u:SELECT_UNREAD *t:SELECT_UNSTARRED *s:SELECT_STARRED *r:SELECT_READ f:FORWARD #:TRASH :LAST_IM_MOLE !:SPAM c:COMPOSE a:REPLYALL n:NEXTMSG o:OPEN *a:SELECT_ALL m:IGNORE j:NEXT k:PREV /:SEARCH u:BACK s:STAR r:REPLY gi:GO_INBOX q:QUICKCONTACTS p:PREVMSG :OPEN gt:GO_SENT gs:GO_STARRED y:REMOVE x:SELECT
I was just surprised by how many they are!