I'd like to hide the blog title and tagline for a sales page. I know how to hide the menu and the sidebar for specific pages, but not the blog title and tagline.

Also, can I hide the RSS links to posts and comments on certain pages? Can I even hide them completely from the header?

I found 2 places that worked to get rid of the feed links:
Don't show the logo in the header configuration (but still show the image)
Header area> RSS Settings.
I added a link to the post feed in my sidebar.

use firebug and look at the elements you want to hide, then prefix the CSS selector with 'body.page-id-nn' where nn is the page ID number (look ath teh <body...> statement to see what this should be.