I noticed earlier that there's been an update to the Flickr API—you can now specify a group id when calling flickr.photos.search to restrict the search to a particular. In the past, we only had flickr.groups.pools.getPhotos available for the searching of group pools and that was rather restrictive—you could only filter by user, or by tag, and the tag filter only allowed one tag to be specified at a time.

The addition of group id to flickr.photos.search is great news—it will provide a much more useful way of finding photos within group pools than we've had before. With it, we can now search pools and filter on multiple tags, date, geodata and licence type.