Costa Rica related:
The Birding Club of Costa Rica - Are you a birdwatcher living in Costa Rica? Or do you visit here regularly? Then look in to joining the Birding Club where you can share your passion with similarly minded folks and enjoy discounted travel to great birding areas each month.
The Sights and Sounds of Costa Rica - Doug Von Gausig's web pages reporting on his four birding trips to Costa Rica in the past few years, COMPLETE WITH SOUND CLIPS of several dozen species of birds.

The Birding Club of Costa Rica - Are you a birdwatcher living in Costa Rica? Or do you visit here regularly? Then look in to joining the Birding Club where you can share your passion with similarly minded folks and enjoy discounted travel to great birding areas each month.

Complete Costa Rica bird list - All currently known 877 species recorded from this tiny country! Includes English common names, scientific names, and recommended Spanish names (from Stiles and Skutch). Due to the size of the file, it is posted in two parts: Non-Passerines and Passerines. [TIP: If the pages don't load completely, try hitting the RELOAD button.]

An Interview with Dr. Skutch - An interview from January 1997 with Dr. Alexander F. Skutch, in which the great naturalist and author reflects back on his 70 years of nature study and bird observation in the neotropics, and specifically Costa Rica.

Artwork by Dana Gardner - The website of the artist who has illustrated many of Dr. Skutch's books as well as numerous field guides, including A Guide to the Birds of Costa Rica.

The Virtual Birder - an online birding magazine featuring virtual tours of birding hotspots and identification quizzes (both visual and auditory!).

Western Birder and Naturalist - nicely done on-line birding magazine focusing on birds of the western US, but with plenty of interesting content for readers everywhere.

BirdSource - a great educational site with opportunities to participate in various of the Cornell Laboratory of Ornithology's citizen science projects such as feeder watches and reports of migratory species.

Neotropical Bird Club - like they themselves say: "for birders and ornithologists dedicated to wild Neotropic birds and their conservation."

Thayer Birding Software - this link to some fine listing software also includes a birding joke page and links to many other birding sites.

Where do you want to go Birding Today? - a site chock full o' birding info and site links.

Northwest Peru Trip Report - where I went birding in February 1999! Wow!

The Americas Natural History Trip Report Repository - Blake Maybank's excellent compilation of on-line birding trip reports in the New World.

BirdLinks - one of the most extensive collections of birding links available on the web.

BIRD - a great online ornithological information source.

Alabaster Ornithological Group - Keith Taylor's site where you can find info on his birders guides to Costa Rica, British Columbia, and all of North America.

BirdsIreland.com - An excellent site for everything about Irish birding, from rare bird alerts to tours and an online bookshop. Also has an annotated complete country bird list.

Broadbill - Koji Tagi's site featuring birds of Australia, Malaysia, and Japan -- his home country. You'll also find his Costa Rica Trip Report here