In the meantime Google Insights for Search is the new Google Trend indicator. Google Insights shows you the search volume for Google queries to special keywords, not for the exact key phrase but for all queries including that keywords. Here you will see the Web search volume for goggle vs. gogle vs. googl:
Thus “gogle” seems to be the most popular typo, followed by “goggle” and “googl”. Wondering about the order? Ok, the first diagramm shows the search volume worldwide. If we limit the data to USA we’ll see that rankings change:
In the States “goggle” is the most popular google typo. Quite some differences between other languages and countries. You can try it out for yourself at Google Insights.