For you that use Lightroom, or thinking of purchasing Lightroom:
Lightroom creates really cool web galleries. Their built in are very nice and effecient. There is a nice variety, but not in the Flash aspect. I have been using the base flash gallery at my site, 11 galleries total and embedded them into a an HTML page. It was a nice setup, but to go back and forth between galleries was a pain.
SlideShowPro is an add-on for Lightroom that makes absolutely killer flash galleries right out of Lightroom. If you have a website and find it a pain to do the HTML and galleries, this makes it so easy to do, it is well worth the money for LR and SSP.
http://www.slideshowpro.net is there website. Check it out.
http://www.blue-echoes.com/portfolio/portfolio.html are my new streamlined galleries.