It's only been a few hours, and it's getting pretty late in Europe--be patient.
I live in the US, so I have no idea about cross-country listings (maybe nobody else does, either--entirely possible nobody here does that). As for general stuff, Amazon usually works well for "commodity" items (say, used DVDs), while big-ticket things like computers where condition and specific specification can have a big effect on price usually are better suited to an auction site.
I've personally not had any significant problems selling DVDs and similar stuff through Amazon--just be sure to accurately describe the thing you're selling in the notes, select the correct condition from the drop down, and (as with most stuff like this) ALWAYS use a shipping method with some sort of proof-of-delivery, in case you get complaints.
The only issue I ever had was shipping an item from the US to a military base in the Middle East, but that turned out to just be because the mail took a REALLY long time to get the item there--no fault of Amazon's, nor the system.
Edit:
I wasnt aware any random joe could sell on amazon..
Sure, and it's easier than eBay--that's what the little "Sell Yours Here" button on any item is for. A lot of the people in the "Used" subsection of an item are large businesses, but it's easy enough for an individual to list there. You list it, pick a price, somebody buys it, Amazon sends you a notice of where to ship, if nobody complains within a set period of time, they deposit the cost and shipping minus their (relatively large, compared to eBay) fee in your account. No PayPal crap (Amazon handles the transaction like any other purchase), no eBay shenanigans, no particular time limit, and if it doesn't sell you pay nothing.
