I’ve always thought there is great power in having both XSLT and XQuery tools at one’s disposal. I’ve seen people tend to polarize into one camp or the other, but in truth there is a lot of common ground, as well as cases where the right technology makes for a much more elegant solution. So learning both is easier than it seems, and more useful than it seems.
If you will be around the conference, take a look at the syllabus. I’m curious to see others’ reactions toward the combined XSLT + XQuery toolset. -m