Location: Congress Center, Covent garden, London

Date: 09/05/2009 - 10/05/2009

This event consists of technical discussions covering a wide range of topics led by some of the Web’s most respected developers. Following the morning tech sessions, they’ll kick off the 24-hour Hackathon. They encourage you to play around with Yahoo!’s Open Platforms, APIs and newest releases such as BOSS, Blueprint, YAP, YQL , YUI3, and more. And of course, feel free to use other open developer tools – they’re hoping to have participation from some of their friends in the community too.

You can find out more information from them on twitter: @hackday

Location: The Cumberland Hotel, London

Date: 15/06/2009 - 17/06/2009

UX London is three days of education, inspiration and skills development in the heart of the city. Bringing together some of the leading practitioners in usability, information architecture and user experience design, this conference will be a mix of inspirational talks and practical half day workshops. UX London will equip attendees with the practical skills needed to do their jobs better, be they budding IAs, experienced practitioners or UX managers.

Clearleft has attracted some of the top speakers in the industry to present at UX London, and we’re still adding more to the line-up. Here are just a few who are already confirmed.

• Don Norman (Nielsen Norman Group, “Design of Everyday Things”, “Emotional Design”)
• Jared Spool (UIE Director, Spoolcast, Web Apps Summit)
• Jeff Veen (ex User Experience Manager at Google, Start Conference)
• Peter Merholz (President at Adaptive Path, UX Week)
• Luke Wroblewski (Senior Director at Yahoo, “Web Form Design”)

Location: Messedamm / ICC, Berlin

Date: 24/06/2009 - 27/05/2009

LinuxTag is the most important place for Linux and open source software in Europe. In 2009, the 15th LinuxTag presents news for professional users, decision makers, developers, beginners and the Linux community - from 24th until 27th June on the Fairground in Berlin. Their main topics this year:

• Mobility
  Small devices with flexible open source platforms give Linux a push. Netbooks and modern cellphones create a new approach.
• Smart Processing
  Open source software helps with growing complexity in a company's infrastructure. It offers scalability, flexibility and security - not only in rough financial times.
• Responsibility
  Many people worry about the aftermaths of information technology. LinuxTag takes a look beyond Green IT. It focusses on financial and energy efficiancy as well as social and public aspects of free software.

Location: Earls Court

Date: 28/04/2009 - 30/04/2009, Time: 09:30 - 17:00

Internet World, now in its 17th year, is the world’s longest running business event serving professionals involved with and utilising the internet. The last 4 years have seen Internet World experience unprecedented growth following a major refocus and a the ever developing nature of the internet and what it means for businesses. Exhibitor numbers have grown from 100 to over 320 and attendees have increased from 5,000 to over 13,000 during this period.