Gmail

Jumping
g, i Go to Inbox
g, s Go to Starred conversations
g, t Go to Sent messages
g, d Go to Drafts
g, a Go to All mail
g, c Go to Contacts
g, k Go to Tasks
g, l Go to Label
Threadlist Selection
A Select all conversations
*, n Deselect all conversations
*, r Select read conversations
*, u Select unread conversations
*, s Select starred conversations
*, t Select unstarred conversations
Navigation
u Back to threadlist
k / j Newer/older conversation
o or Open conversation; collapse/expand conversation
p / n Read previous/next message
` Go to next inbox section
~ Go to previous inbox section
Application
N Compose
/ Search
q Focus chat contact search
? Open shortcut help
Actions
, Move focus to toolbar
x Select conversation
s Rotate superstar
y Remove label
e Archive
m Ignore conversation
! Report as spam
# Move to trash
r Reply
R Reply in a new window
R Reply all
A Reply all in a new window
f Forward
F Forward in a new window
,, u Update conversation
, Send mail
<Esc> Focus last chat mole
] / [ Remove conversation from current view and go previous/next
} / { Archive conversation and go previous/next
z Undo last action
. Open more actions menu
S Mark as read
U Mark as unread
_ Mark unread from the selected message
^s Save draft
+ or = Mark as important
- Mark as not important
g, w Create a blank document
h Sneak peek
g, p Make a phone call
T Add conversation to Tasks