From the fall of Palm (and subsequent purchase by HP), the introduction of Windows Phone 7, and the incredible flow of new Android launches, 2010 has been a landmark year for mobile.  In eight years in the industry, I've never seen phones launch this quickly.  Given the onslaught of mobile OS' that have made their way across the carriers this year, the field is larger than ever, and opinions are running strong.

So, I ask you - which mobile OS is your favorite (right now, at least)?  Cast your vote and defend it in the comments section!