Are you after a free gallery or a paid one?
Photopost is a good option, as is
[S]Photoplog Pro[/S]. Both are paid scripts, though Photoplog has a
lite version. The lite version has some restrictions.
I use Photopost on my forum here:
http://www.digiscrapforum.com/gallery/
[s]And Photoplog Pro on my forum here:
http://www.hunnybeedesign.com/forum/gallery/index.php[/s]
I did try a couple of others but have found these two to be the best so far. Hope that helps
**EDIT - I no longer use Photoplog as the support was nonexistent and I had issues with some galleries not allowing uploads....and since I couldn't get any support I dumped it. Lesson learnt to look at the status of support before I pay for a product