photi.ca -- photo gallery host
Hierarchical folders, instant & reversible image editing, multiple parent folders, tag combination searching, AJAXy popups and page updates, watermarks and size restrictions ... and easily capable of organizing my collection of 14,800 images (so far).
Has its own colocated server, open and free signups, and a single developer (me!) who reads his mail and acts on feedback.
Some entry points: San Diego December 2005
, my 1980's geek cred
, a search for the tag combination ontario and long.exposure
, my folder tree
, the photomosaic page
, and the answer to the question, "why reinvent the wheel?
" Many more features in the works.