What are ORG NET ORG.UK etc.. For?
ORG NET etc... were originally developed to help Internet users distinguish between normal companies (com) and non-profit organisations (org) or Internet related companies (net).
The problem is no one has really policed this system. What has happened is people have bought the domain which is available which closely matches their business. Many org net, org.uk domains have been bought by companies despite them not being non-profit or Internet related.
The country codes ie .uk, .fr, .pl etc are usually an indication of where the company is located. Different countries have different rules as to who can register their domains, so even some of these can not be trusted all of the time. There are no doubt companies who are registering specific country codes as it enhances their domain name. For instance if you were running a Information Technology company (IT) you may look at getting a website with the IT domain (IT for Italy).
For a full list of European domains you could take a look at EuroDNS we at Duo have never used them ( we like to stick to good old co.uk and com ) but looking at Euro domain names may get you a really catchy web address. Be careful though as some countries insist you are based there, or you at least host your site there. It can be tough enough speaking with techy types, imagine how bad it could get speaking with Euro Techs?