HN user
I still find it surprising that some people - who use a computer often - don't know keyboard shortcuts, e.g. for copy/paste. So forget the average person having programming skills.
Have a look at http://www.kuvva.com which rotates my desktop background with some really nice, unique wallpapers
My thoughts:
The colours don't work for me. Changing the blue on the title bar may help, make it darker. Have you ever used Adobe Kuler?
The Green colour doesn't add anything
The search placeholder text is not centered (vertically) and spoils the flow when reading from left to right
Try and get your font sizes consistent.
Make the margins of the title bar consistent with the in-page gifts.
Centre the login/password boxes
On Find the Perfect Gift, all the options are buttons making me think that when I click them, I'll move onto the next section.
I like the wizard aspect, just needs to be improved. Perhaps the title bar should appear once the wizard has been completed, or cancelled, so my eyes are not all over the place on first visit.
Try improving how the bookmarklet works.
When I click 'Save It' a new tab opens (in Chrome) and prompts me for my username and password. How about an in-page popup instead?
One for the future, how about some localization? I'm in the UK and want to buy things off Amazon.co.uk.
Good luck with it!
Before I opened this post I was expecting you to be very old. Get started today. Honestly, it's never too late.
Personally I'm more interested in the stories. Following specific people might not yield the variety that I would like if they do not submit stories regularly, so my preference is still the home page as it stands. As an option though, I guess it might be useful, there are definitely a couple of commentators and friends I would like to quickly view, both their submissions and recent comments.
Seriously well done. It's an achievement regardless of your age. But that you are 14 just makes me think more highly of this for a variety of reasons. Good luck!