I notice there is a new version of Sculptris digital sculpting software available from Pixologic.com (creators of ZBRUSH) Not sure how much improvement they've made. Seems to work much better for me, although that may be due in part to a newer computer. 

There is a new direct link to export models directly into Zbrush if anyone uses Zbrush. Pixologic also have several tutorial videos for Sculptis on their site. Best news, it is still a free do-as-you-will download. 

Download link:  http://pixologic.com/sculptris/

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As a writer, I control the lives of millions. Whole worlds can be destroyed by typing the correct sequence of letters on my keyboard.

Robert A. Read