Looks like a google penalty but no reason given

Hello,

First I'd like to say that I'm no SEO expert and I have a little knowledge in anything regard it.

My website - http://www.metaclock.com was the 4th result for the search term "online alarm clock" (in any country and language I checked - mostly english) and other keywords

but for a week now it's went directly to the second page!

I didn't touch the website for more than a year (I don't really need to change it, as it's only give free service to people who enter)

In my Webmaster Tools it tells me that my website is having "Big traffic change for top URL" , but no message or e-mail was given of any penalty what so ever.

Yes, I've heard that google changed something in their algorithm a week ago but the current situation doesn't even make sense to me,

websites ranked way below me went to be first results while I got to the second page, I was the 4th or 5th result for search term "online alarm clock" for years,

and now I got way below while one of the new top sites doesn't even have a homepage (I got a 404 page) and another is a just a flash (.flv) file - as I said, I'm really novice to SEO but this really doesn't make sense to me.

I'm really frustrated. I hope someone can help me.

Thank you

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