When you are on the market there should be an option to upgrade. I simply upgraded and then when I had an error I went back to the market and searched for "Google Maps" and when it came up I used the uninstall button, followed up with searching and installing.
ahhh uninstall that way - never thought of it. thanks. i did a su mount and rm and cp. 3.3.0 works fine now, but as picked up by the Think Tank thread in Dev forum - the navigation is borked. Even for 3.2.1
now i can try uninstalling Amazon MP3 that came packaged with cyanogen... i'm in oz - no point having it.