Gene Munster, analyst for Piper Jaffray, has said that Apple may sell as many as 10 million iPods (free registration req.) in the June quarter. Using data from the NPD Group, Munster claims, “The 9.5 million - 10.0 million unit approximation is based on various assumptions and is an extrapolation of two months of data.” Munster continued, “When the third month of data is released, our analysis will likely lead to a slightly different…