Weekend Cat Blogging #44 has a great selection of cat photos for you to enjoy.

Carnival of the Cats #107 links to the best cat blogging of the week, and there are certainly some fantastic photos to be seen if you follow any of the links.

The 28th Philosophers’ Carnival is full of great writing that will satiate even the most finicky of thinkers.

Grand Rounds Vol. 2 No. 29 is the best of the medical blogosphere.

Tangled Bank #51 is a compilation of all the best science news.

Carnival of Education #62 covers the best in education blogging.

The 32nd Skeptics’ Circle is a great way to get your doubt on.

Friday Ark #82 has a wide variety of animal news and photo links for you.

I and the Bird #21 has the best of bird blogging and news, and this edition takes it a step further by offering up links to a significant number of related books.  Very cool idea.