Are There Any Common XSL Transform Stylesheets?

I'm wondering if there are transforms for standard formats.

[cmarshall]

Okay, I'm chugging along pretty well here. I'm getting the hang of PHP 5's XSL support, and I should be rolling along soon.

Now, what I would like to know is if there are pre-designed stylesheets for common XSL transforms, such as Excel XML/Word XML to XHTML 1.0 Transitional, etc.

I would be interested in knowing about either open source or commercial offerings.

I'm not sure how many would be allowed to be mentioned in public on this forum. Maybe some of the more common OSS ones.