I stumbled upon this extension some time ago and love it. Easy enough to set up, and it just works. The free version I use adds a small banner "Powered by LoginRadius". In any event, this appears to do the job as well as anything else out there.
A lot of my site consists of category blogs which contain reduced product photos which I want to be clickable to expand to full size. I like the fact that this plugin doesn't rely on Mootools because with J! 3.x it won't be needed. Awesome work!
I'm telling fellow Joomla developers about this. Not only is it really full-featured and well documented and supported, it's quite inexpensive for a lifetime license for the Pro version. Highly recommended. Well done, Matej!
Simple Review is a great extension for featuring recommended recordings (LPs, CDs, and downloads) on my website, grouped by genre (classical, jazz, rock, etc.). Hopefully the user submissions part will get the bugs worked out.