1 in 3 choose iPad over TV

And 43% spend more time on their tablet computer than on their laptop or desktop PC

Source: AdMob

This chart is from a survey of more than 1,400 tablet computer users conducted by AdMob, the online advertising company that Google (GOOG) snatched away from Apple (AAPL) in 2009. I missed the report when it was released last week. The extent to which tablets have cut into PC use is surprising.

"I think this trend is really important," wrote reader David Emery, who spotted it on TUAW. "If it continues then computing is in for a huge sea change."

Also on Fortune.com:

• Waiting on the iPhone 5
• iPad 2 demand 40% greater than iPad 1
• The man who won Steve Jobs' trust

[Follow Philip Elmer-DeWitt on Twitter @philiped]