Hello Jason,
I maintain the
Geeklog<->Gallery2 Bridge.
Gallery2 is still by far the most powerful open source gallery software available.
Development on G2 has completed save a few of us continuing to extend its capabilities.
Gallery3 is nearing release, but there won't be an external API for the first release cycle.
I can offer you any support you may need.
Be aware that the server requirements for any of the gallery solutions is fairly high.
48MB Ram, a graphics toolkit like imagemagick/netpbm and for video ffmpeg.
-s
FlashYourWeb and Your Gallery with the E2 XML Media Player for Gallery2 -
http://www.flashyourweb.com