This will probably be a controversial post as the topic has certainly been controversial. SearchMetrics.com published an article that took a look at the SEO benefits of .com vs every other extension. Now Google has always said there is no difference and Matt Cutts has debunked the new gtld crowd that said they would have a benefit. Matt wrote on his Google + in May 2012:
Technically, it is not sensible to a priori discredit certain domains based on their domain extension. So far no recent evidence exists, from any search-engine company to penalize either of .info, .biz, .com, .org, .net, .name domain extensions or weigh them differently.
Rand Fishkin wrote an article on MOZ.com and included the image below which looked at ranking elements.
Here is a community discussion on Moz.com where members disagree on whether or not extension matters.
Back to SearchMetrics.com
You should be aware that SEO encompasses many things including high quality content, organically placed keywords, link building, the speed of the website, and a host of other things. However, a .com—instead of other options—is also great SEO fodder. It helps with “brandability” because let’s face it: a .com looks more authoritative, is more common, and is more popular than any other option. It is memorable – our minds are wired to think “dot com”!
They also included an infographic: