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You can just make a custom block, stick your static html in it, weight it to "0", call it "Welcome", set it for center block - center, and off you go. At least that's what I did to have a static welcome page to sit above some other blocks on my news start page. It works.
I went one step further. I set that welcome block to be visible only to anonymous folks, and when the users log in, the welcome box disappears, another one visible only to registered users takes its place, and the rest of page stays the same. I love this group permissions thing a lot! lol