wordpress plugins?
 

looking for something that will post a thumb of a pic, then load it when you click on it in the post.

anyone know of a plugin for this?

Not sure if this will help you or not.

http://fredfred.net/skriker/index.php/iimage-browser

You still need to make the thumb yourself but it allows you to add the thumb to the post and it handles the rest of the code whether it be link to the large pic or custom code that you input.

iimagebrowser is what I use, you can make a thumb when you upload, or afterwards.