Discussion on:

Poll: What mobile OS is easiest for developers?

you are asking multiple questions here. I've done some development on all the platforms mentioned. Hands down Microsoft makes the best developer tools period, and has for at least the last decade. That said I actually prefer the Android SDK and API over the WP7 application framework. Blackberry was miserable for me in terms of development tools and the SDKs. I have the least experience on iOS. I hate that Apple limits their developer community to those running MACs. That said, it doesn't take long to get spoiled by x-code and objective-c. While it seems very foreign in the beginning you'd be surprised at how good the tools actually are, and how much they can do for you once you get a solid feel for them.

As a computer engineer, my answer is: "depends..."
Easy to make a Hello World application? -> WP7. Great tools
Easy to make a robust app? -> iOS. Great framework.
I don't have experience on the others platforms.

I'm an iOS developer and I find it very "glamorous" to develop for it, it involves less manual labour than Android for instance. I've tried to develop for WP7 since I have a small .NET background and found it to be as comfortable as for iOS. As for Android - it's very hard, Eclipse always lags and bounces out, you have to consider a lot screen sizes as well as emulator lags a lot. It's harder to test on the device, you get strange issues etc. What do you think? why do you find it easy to develop for Android? tell me, maybe I didn't consider something...

I know I'm in the minority, but I come from a notepad (now Notepad++) background. Microsoft's APIs are much harder to use when you are not as familiar with the high integration with Visual Studio (since I normally use MinGW). Since I'm only familiar with Microsoft's and Google's APIs (and neither are a piece of cake when you want to do more than simple things - think multi-threading), I would like to know what people think the best API is. I ask this, as I would like to learn more systems.

It is possible that learning a language takes some time while most developers already knows Java or C#.

I have the most experience with Android. I like Eclipse but the Android plugin has its problems. The latest version causes a lot of crashes and I can't revert back to the old version.