2-3 Months ago I was ranked on page 1 with Google for a particular keyword. Then, just like that, I am no where to be found. I am assuming one of Google's updates hit my site. However, I am still ranking for Bing and Yahoo. What can I do to rank with Google again? All help is greatly appreciated! Thanks
Keep adding fresh content to your blog/site. Create relevant backlinks, and provide something of value to your visitor. And be happy that you are ranking so well on Bing and Yahoo.
What @danasurvey said, plus make sure you don't have tons of outbound links that are do-follow and lead to spammy sites. Also, are you keyword stuffing, autoposting, using hidden text or links on your page or images, etc.? If your blog is still really young, is it possible that you've been sandboxed? There is an online Google sandbox checker. I know Search Engine Genie has one, probably there are others, too. Just do a search.