Top Cloud Computing Companies

Cloud Computing is  certainly a very hot topic and it seems everyone from Oracle to the smallest startup is claiming to be in the space . Gartner estimates that the Cloud Computing market will reach $25.07 billion by 2013.  This is up from an estimated $11 billion in 2009. Talk about a growth industry.
Here is a list of companies to watch.

http://itmanagement.earthweb.com/features/article.php/12297_3835941_1/85-Cloud-Computing-Vendors-Shaping-the-Emerging-Cloud.htm