IT IS POSSIBLE to access the BBC iPlayer content outside the UK if you use a proxy or VPN, accessing through a server in UK.
The BBC server has to think that you are requesting content from a location inside the UK.
The fundamental way that this works is that your request for content is to be routed from your normal location (the one that woukd be seen by the BBC if you were not using a proxy) via a series of servers worldwide finally "exiting" at a server located in the UK. This way the BBC server has no way of telling that you are not actually in the UK.
Here is the basic proceedure on how to use Vidalia Tor to access the BBC.
BEWARE! The are many saying that they can do this for free and then want you to pay them money for them to tell you!
It amuses Tempusfugit that when you search the Internet for "How to watch iPlayer outside the UK" you find a host of blogs where the comments are mainly along the lines of carping on about whether you have paid your UK television license, are a UK resident or pay taxes in the UK! Very little is mentioned about the techinical issues relating to GeoIP circumvention.
While it is true that the BBC seem to be more aggresive with respect to getting viewers in the UK to cough up their license fees, the issues with the availability of iPlayer programming is nothing to do with this! It is not the position of this website to discuss the whys and wherefores of the licensing and marketing of BBC programming world-wide. Issues such as why BBC Canada carry ITV programming (as well as really cheap advertisements [for those advertising - if the quality is anything to go by!]).