in IE:
backspace or alt+left = back
alt+right = forward
tab = next field
shift+tab = last field
in word (or most text editing things (including text boxes and such))
ctrl+right = next word
ctrl+left = last word
ctrl+up = last paragraph
ctrl+down = next
oh, i just found this
http://www.bilbo.com/shortcut.html
that just about covers everything. oh well.