Adding Pages to wordpress

Let me explain the need:

I want to be able to add material to a blog style site such as galleries, links, or even PPC links. I don’t want them to appear with blog entries, but rather as pages alone using the same layouts as the blog theme.

I thought to create functions like is_ppc or is_link or is_gallery – but I can’t see how to easily integrate this to the code.

Any ideas?