I like to make GPX files on my desktop then download them to my tablet for use by Maemo Mapper.

After grumbling that I had to screen-scrape output from gnuite.com instead of "save to file", and having to copy addresses across from Google Maps once I'd found some that worked, I've finally written my own script using the Google API and then parsing KML.

It doesn't work with multiple destinations, but it will do "avoid highway" and "walk". The interactive map won't let you edit the route graphically, but you can paste in a link from a customized route on Google Maps and convert that to GPX. These limitations may be fixable with more work.

http://gpx.geotags.com/

The site also works for live downloads. I was playing with multi-homing
using DNS so it's currently on 2 servers. If anyone wants to clone it onto another server, or take the code and improve it, please ask.