A deal's been agreed which will abolish data roaming charges within the EU by June 2017. This will be a major benefit to people who frequently travel to different countries for work or leisure - currently it's easy to rack up very high data charges (which frequently exceed $1/MB).
More details at:
http://www.bbc.co.uk/news/technology-33325031
(One reason I chose my current telecoms provider - Vodafone - is that they have extremely reasonable data roaming rates.)