Have you ever tried to use wordle.net on Chrome? It doesn't work . . . no problem, just use IE Tab and you'll be able to create a wordle in Chrome!
With IE Tab, you are able to display web pages using IE within Chrome. Sites that use Java, Silverlight, ActiveX, Sharepoint, and more are now accessible!
Install the extension and when you come to a site that does not ordinarily display in Chrome, just click on the icon and it will open as if using IE.
Speaking of word cloud generators, have you tried Tagxedo? It's Wordle on steroids! Choose from many shapes and create dramatic word clouds! Don't forget to use IE Tab on this site too!