Gmail

c – compose a new mail
/ – puts your cursor in the search box
k – move to newer conversation
j – Move to older conversation
n – next message
p – previous message
o or Enter – open a conversation
u – return to conversation list
y – archive a conversation
m – mute (archive and make all future messages from this conversation skip the inbox)
x – select conversation
s – star a message or conversation
! – report spam
r – reply to a mail
a – reply to all recepients
f – forward message
Esc – escape from input field
ctrl+s – save draft

key combos

tab then Enter – send message
y then o – archive your conversation and move to the next one.
g then a – go to all mail
g then s – go to starred conversations
g then c – go to contacts list.
g then d – go to drafts
g then i – go to inbox

Official list of Gmail shortcuts

Google Reader

j/k – selects the next/previous item in the list
space/shift-space – moves the page down/up
n/p – in list view, selects the next item without opening it
o – in list view, expands or collapses the selected item
enter – in list view, expands or collapses the selected item
s – stars the selected item
shift-s – shares the selected item
m – switches the read state of the selected item
t – opens the tagging field for the selected item
v – opens the original source for this article in a new window
shift-a – marks all items in the current view as read
1 – displays the subscription as expanded items
2 – displays the subscription as a list of headlines
r – refreshes the unread counts in the navigation
shift-n/p – selects the next/previous subscription or folder in the navigation
shift-x – expand or collapse a folder selected in the navigation
shift-o – opens the item currently selected in the navigation
gh – goes to the Google Reader homepage
ga – goes to the “All items” view
gs – goes to the “Starred items” view
gt – allows you to navigate to a tag by entering the tag name
gu – allows you to navigate to a subscription by entering the subscription name
u – hides and shows the list of subscriptions
? – displays a quick guide to all of Reader’s shortcuts

Official list of Google Reader shortcuts

Google Calendar

calendar view

c – Allows you to create a new event. + c allows you to create an event in a new window.
/ – Places your cursor in the search box
p – Moves your calendar view to the previous date range
n – Moves your calendar view to the next date range
t – Moves you to the current day
d – Displays your calendar in the “Day” view
x – Displays your calendar in a customized view
w – Displays your calendar in the “Week” view
m – Displays your calendar in the “Month” view
a – Displays your calendar in the “Agenda” view
q – Opens “Quick Add”
Esc – Brings you back to the default calendar view

event view

Enter – Expands a collapsed region
Tab – Moves your cursor to the next field
Alt then s – Saves the event
Esc – Brings you back to the default calendar view

Official list of Google Calendar shortcuts

Google Maps

arrow keys – pan the map in various directions
page up, page down, home and end – pan out even wider
+/- – zoom in/out

Official list of Google Maps shortcuts

Google Video

space bar – play/pause
right/left arrow skip -jump back 5%
up/down arrow – increase/decrease the volume 5%
m – mute
f – toggle full screen
Esc – return from full screen to normal mode

Official list of Google Video shortcuts

Google Docs & Spreadsheets

Ctrl+B – bold
Ctrl+C – copy
Ctrl+I – italicize
Ctrl+P – print
Ctrl+S – save
Ctrl+U – underline
Ctrl+V – paste
Ctrl+X – cut
Ctrl+Y – redo
Ctrl+Z – undo
Shift+Tab – move to previous cell/row
Tab – move to next cell/row

The above are only the shortcuts which work in both docs and spreadsheets. For a full list of all keyboard shortcuts in these two apps, see below.

Official list of Google Docs & Spreadsheets shortcuts

Netvibes

main panel

h – show help
arrow keys – navigate through modules
e – edit module
d – delete module
p – publish module
Enter – perform action on module (depending on the module, it can be open feed, start typing, etc)
Esc – removes focus from current module
a – add content to your Netvibes page
j and k – navigate through tabs

tabs shortcuts

t then o – opens tab options
t then 1,2,3,4 – sets the number of columns to 1,2,3 or 4 in the current tab
t then r – rename tab
t then d – delete tab

content panel

h – show help
a – add new feed
b – go to Netvibes ecosystem
t – close the content panel

feed reader

h – show help
n – next item
p – previous items
a – mark all as read
u – mark all as unread
Esc – close feed reader

Official list of Netvibes shortcuts