Travel grants from various organizations are being made available for early-career scientists wishing to come to ESOF2012. To apply for some of these grants, you need to register with ESOF. Currently, Euroscience, the Swiss Embassy in Ireland, and the Swedish Research Council are for example offering the joint Early-Stage Researcher travel grants. (The deadline is 10 May 2012.)
Other organizations are offering travel grants. You can keep track of these through news announcements on the ESOF Web site or through their Twitter feed (@ESOFHub). Research Foundation Flanders (FWO), for example, is invites early-career researchers in Belgium to apply, and the Danish Agency for Science, Technology and Innovation (DASTI) will soon open a call for early-career researchers based in Denmark.