Appcelerator released its Q4 developer survey this morning (n=2,160 developers). It does the survey quarterly in conjunction with IDC.
There are a number of findings but the big ones are: Kindle Fire has rocketed past other tablets in terms of developer interest and Windows Phones similarly moved past RIM:
Despite their enthusiasm for Kindle Fire, developers expressed concern about increasing fragmentation in the Android universe.
It's important to keep in mind that these findings are based on perception and not an indication of actual market share; however they're correlated with consumer adoption in many cases. Developers are excited about the Kindle Fire's low price point and perceived demand. It also appears that developers have largely given up on RIM. However if new RIM devices showed consumer traction we'd see these figures change again. Consumer adoption and audience size are the key drivers of developer interest followed by capacity to monetize their apps.
Another finding of the report is that there's relatively little developer interest in "connected TV" (e.g., Google, Apple TV) -- at least until consumers show interest at scale.