In this video by Google’s number one spam cop Matt Cutts, he first denies and then basically confirms straight after that part of Google’s algorithm to determine the quality of a page looks at spelling and grammar of the information on the page.
Whether the algorithm actually picks up that the spelling and grammar is incorrect as part of the page rank or if it’s in combination with the user engagement of the page and time spent, it’s a good reminder to run everything through a quick spell check. Tip: Before publishing your content walk away from the computer for an hour and come back with fresh eyes to proof read if you are worried about there being mistakes.
What are your thoughts on incorrect spelling and Grammar on a site? Does it matter to you?