I've tried several before with mixed results, but none with Joomla 1.5.
I installed this but then it crashed my install. (Deactivating it fixed this immediately). Turns out, I needed to have PHP 5 running on my server.
I contacted my host, and got that running in no time. (My Joomla install survived just fine... but now it seemed a bit faster)
Then, then UniversalPlayground got working just fine.
It's easy to use, and I like it very much. No nonsense, but also, nice and clean looking. It's great!
I can't get the slideshow part to work, but I prefer the lightbox look anyway.
This is an under-rated plug-in, for certain.