WordPress 2.9 RC1 is released and the new post thumbnail function will not change until the final version hopefully. I was chatting a little bit with Sergej Müller last night and we were trying some things out. We found out the following things: Edit: Some little changes, see Matt’s comment. You can provide 4 picture formats to the function (change the width and height values to your need): // the
![The Ultimative Guide For the_post_thumbnail In WordPress 2.9 | WP Engineer](https://cdn-ak-scissors.b.st-hatena.com/image/square/d152907115e6a8519e2109296fe94c7d96fc52f7/height=288;version=1;width=512/https%3A%2F%2Flh5.googleusercontent.com%2F-OdBxSv4WTqg%2FAAAAAAAAAAI%2FAAAAAAAAABI%2FpYkMvumqKRc%2Fs250-c-k%2Fphoto.jpg)