What is the best way to travel from Bangkok to Saigon/Ho Chi Minh City?

I was thinking about going from Saigon to Bangkok in the summer. It looks like a real effort, the only way is to get a bus through Cambodia. Im pretty sure you can get a visa at the border. This link should help a href="http://wikitravel.org/en/Bangkok_to_Ho_Chi_Minh_City_overland" rel="nofollow"http://wikitravel.org/en/Bangkok_to_Ho_C…/a