I like the idea, but the design has a couple of flaws:

- The heading text is hard to read (perhaps choose a different font?)

- The button's rollover states aren't preloaded, makes it a bit awkward. Preload them, or better use CSS sprites

- The PNG buttons aren't blending properly with the content's background image

- The tour's screenshot thumbnails should be small images, not large images resized with HTML. End result is that each one is ~200K. Easy to fix and would make the page load a lot quicker

Its a really nice idea though - I think people would love to get a collection of letters from friends on their birthday, anniversary, etc. Keep going!