Blogger has several keyboard shortcuts you can use while editing posts. They definitely work in Internet Explorer 5.5+Windows and the Mozilla family (1.6+ and Firefox 0.9+), and might work in other browsers. 
Here they are
control + b = Bold
control + i = Italic
control + l = Blockquote (when in HTML-mode only)
control + z = Undo
control + y = Redo
control + shift + a = Link
control + shift + p = Preview
control + d = Save as Draft
control + p = Publish Post
control + s = Autosave and keep editing
control + g = Indic transliteration
