In windows, home and end jump to the end of line/beginning of line, so I frequently hit shift-home or shift-end to select a whole line of text, then I copy or cut and move it.
I found app-specific hacks here:
http://www.starryhope.com/tech/apple/2006/keyfixer/
but I haven't checked out how it works yet, as I think I can add Thunderbird and other programs myself. Or I'll just re-adjust...