I havn't explored what Xara can do for web graphic optimization, so what I currently do is create the images with Xara, export them as gifs or jpg's depending on if I need quality, transparency, or minimal file size, then optimize them in Photoshop (save for web).
Heres a site thats all Xara, however not yet optimized in photoshop, and its all gifs, so it is currently pretty big.
Y102 Country.com
http://img.villagephotos.com/p/2003-2/76617/MSYUIJJOGIOZED[LTWMJ-rstag3.gif
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