The IITK Workshop on Algorithms for Processing Massive Data Sets is being held as a post-conference workshop with the 29th Foundations of Software Technology and Theoretical Computer Science conference (FSTTCS, 2009).
There is no registration fee for attending WAPMDS, 2009 alone. For attending FSTTCS, 2009 or its allied pre-conference workshop, the specified registration fee structure applies.
However registration is compulsory for all participants of WAPMDS, 2009. Registration can be done at the FSTTCS, 2009 registration page here.