Good Domains.
Each will likely go for high $x,xxx low $xx,xxx as the term "Photocast" travels & popularizes across the globe during 2006, 2007 & beyond.
Remember: the term "Podcast" caught fire and has enjoyed immense popularity. Since Apple & Flickr/Yahoo are investing guts & capital to the success of Photocasting, "Photocast" will follow & may surpass the "Podcast" footsteps.
PhotocastForum.com has good mindshare & a nice future.
Good Luck.
Mike