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I created a repository for hosting a blog on github.Is there any way that I can create more to host multiple blogs?Am I limited to just one repository for hosting(since username.github.com can only be used once?)

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You can have one site published to https://<username>.github.io by publishing to the master branch of a repository named “username.github.io” (substituting your actual username).

You can also have an additional site per GitHub project published to https://<username>.github.io/<project>. Project settings let you choose which branch and directory to publish.

A better description is available in the GitHub Pages documentation, including options for using custom domain names.

(since April 2013, all username.github.com are now username.github.io)