While the temperature and pressure on the surface are far too great for colonization, there is an area 50km above the surface where the temperature and pressure are Earth-like, the winds circle the planet in 100-hour "days", and the gravity is just less than earth-like. Because the gases there are heavier than Earth's atmosphere, there is the possibility of "floating cities" kept in place and following the prevailing winds much like present day hot air balloons. See also Wikipedia:Colonization of Venus