Here are links to various "let's colonize Mars" societies. They are serious. Part of me is "come on, are you insane?" Another part of me, the part that devoured sf books when younger, would actually love if that was a reality.
In any event, the science (a lot of them discuss technology, biology etc) makes a fascinating reading.
Red Colony Mars Colonization Making a case for colonization Quest to Mars Yet another Mars page. With neat graphics Colonizing Mars Google page Conference on colonization Surprisingly (or not, when you think of its atmosphere) there isn't anything about colonization of Venus. Me, Saturn is what I am interested in.
This bit of randomness (and wishful thinking) is brought to you by Dangermousie :D