TipMonkies has a list of keyboard shortcuts you can use when writing or editing your posts in Wordpress:

Bold: Alt+SHIFT+b
Italics: Alt+SHIFT+i
Link: Alt+SHIFT+a
Blockquote: Alt+SHIFT+q
Code: Alt+SHIFT+c
Read More: Alt+SHIFT+t

Unordered List (ul): Alt+SHIFT+u
Ordered List (ol): Alt+SHIFT+o
List Item (li): Alt+SHIFT+l

These shortcut may not work in some browsers, or some versions of browser.