On September 1st, Apple announced that 120 million iOS devices were sold to date.
We know that there were 59.6 million iPhones sold through June (from SEC filings)
We also know that 3.2 million iPads were sold.
If we assume about 8 million iPhones and 4 million iPads were sold during August and July, the total number of iPod touch sold is 45.2 million.
That is 37.7% of total units.
In April I wrote that 41% of all iOS units sold were iPod touch to date.
The expansion of iPhone distribution plus the addition of iPad as reduced the platform footprint for the iPod, but it’s still a sizable chunk. More than one in three iOS units in use are non-cellular devices. As the iPad rolls that number could move toward 50%.