Here are links to other cool IBM and modeling related sites on the net:
Karl Sims Homepage - See his interactive works, computer animations, and technical papers. His "evolved virtual creatures" was inspirational for the development of the Critters! simulation environment.
BIOTA.ORG - A great site full of artificial life information, projects, downloads, and links.
International Society for Artificial Life (ISAL) - From their Mission Statement: Dedicated to promoting scientific research and education relating to artificial life, including sponsoring conferences, publishing scientific journals and newsletters, and maintaining web sites related to artificial life.
WWW-Server for Ecological Modelling - This is a register for ecological models. Most of the models are not individual-based, but you will find a wealth of information on general modeling here. Unfortunately, the page is poorly maintained and contains several broken, outdated links.