I just tried mine, I'm using the VGA cable to a Sony 60" HD-TV and I don't have any blue/purple tint at all. Though sometimes I get the blue/purple tint on the iPad when I accidentally select the whole screen, in copy mode, and sometime, it's hard to get ride of, usually close the app and re-open it and it's gone. I must say that it's amazingly sharp most of the time, considering that it's enlarge a lot on a 60" screen.
Google Maps are very good in sat mode. I'll be glad when more apps support AirPlay.
If your using the new adapter, 30 pin to HDMI, maybe it is the HDMI handshake causing it to discolor for a couple of seconds, until the iPad syncs up with TV.
FYI; I have heard that there's an app that allows you to control the iPad from the iPhone or iTouch, via WiFi, so you can control the iPad from across the room, instead of jumping up and running over to the iPad to change things. I can't remember the name, but I think it's in the app store.