DSTAUDIGEL  This software is AWESOME. I love X-Tunes. Unfortunately, it doesn't work so hot with Intel macs. Some people have come up with some creative ways (that I have been using for the past few months). Having gotten tired of this, I devised my own solution involving Quicksilver:

http://mountainmandan.net/2007/09/20/x-tunes-with-quicksilver/  
(Version 1.2.6)

DANIEL STAUDIGEL  With respect to GPS data... you can. All you do is make your own tag. In the comments field, just add in"[lat: 12.345] [lon:12.451]" and use [lat] and [lon] in the template. It automatically recognizes the new fields, and makes sure they make it into the final website. For those photos that do not have that data, "NA" is substituded, for Not Available.  
(Version 0.5.4)