On July 17-21, the Scientific Computing Division of the National Center for Atmospheric Research (NCAR) will host two concurrent meetings for scientific users of IBM high-performance computing systems. Attendees who register by June 30 will get an early registration discount. Registration and meeting information: http://www.cisl.ucar.edu/info/scicomp. ScicomP is for computational scientists and engineers interested in achieving maximum performance and scalability on IBM HPC systems. SP-XXL is a membership organization focused on systems-oriented interests in large-scale scientific computing on IBM hardware. NCAR scientist William Collins will be the keynote speaker for both meetings, which will feature a day of tutorials. Students are welcome, both as regular attendees and tutorial-only registrants, at reduced rates. Contact: Susan Cross, NCAR/SCD, 303-497-1133