Analyst Gene Munster surveyed 45 Apple developers at last week’s WWDC to find out how many developed on other platforms. While the number of developers he spoke with is quite small (considering there were 5,000 registered for the event), there are some interesting results.

Only 7% are also developing apps for the Mac, down from 50% in 2008.Nearly half (47%) write apps for Android, 36% for Research in Motion’s (RIMM) BlackBerry, 13% for Microsoft (MSFT) Windows Phone 7 and 7% for Hewlett-Packard’s (HPQ) WebOS.

iOS developer survey: 47% are on Android too, only 7% on Mac [Fortune]