The best way to find out about new photos will be to follow the Photo Blog. There is an RSS feed you can subscribe to there.
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National Parks, Monuments, and Forests:
Galleries spanning multiple trips (and years) to various national properties and surrounding beautiful areas.
Regional Collection:
Galleries (possibly spanning multiple trips) which are focused on a specific region or subject. Usually places that are not part of the National Parks collections.
Thematic Collection:
Galleries organized by theme. These may be collected by content, technique or process.
Pacific North West Events: A collection of galleries from events and trips from around the Pacific North West. These are a combination of snapshots and gallery photos
Other Events and Trips:
A collection of galleries from events from other places. These are primarly tripographies. These are a combination of snapshots and gallery photos.
Miscellaneous:
A catch-all collection of galleries of events from other places that don't fit anywhere else.
OMSI events:
A collection of photos from events by the Oregon Museum of Science and Industry. Mostly from Science Pub.
Pricing information for both prints and files can be found here.