I’ve recently come across some round-ups of great photos:

• The Smithsonian is hosting a gallery of terrific nature photography–the kind of thing that makes me want to pretty much cash in my chips behind the lens.  My wife remarked (a la Say Anything), "Finches, man–finches." [Via]
• The PDN Photo Annual 2007  is chock full of arresting images.  The Photo Books section alone has sent me on a dozen fruitful tangents across the Web.
• The Press Photographer’s Year highlights some of the most impactful images captured over the last 12 months. [Via]
• American Photo’s Images of the Year contest has issued a call for entries.  While those are filtering in, you can browse the 2006 gallery. [Via]