Torch mobile has been acquired by Research In Motion (RIM), therefore Iris Browser is no longer available for download. Here is a quote from website:
RESEARCH IN MOTION (RIM) ACQUIRES TORCH MOBILE
Thank you for visiting our site.
Torch Mobile is excited to announce that our company has been acquired by Research In Motion (RIM), one of the most renowned mobile technology companies in the world. Our team of developers will join RIM’s global organization and will now be focused on utilizing our WebKit-based mobile browser expertise to contribute to the ongoing enhancement of the BlackBerry® platform.
Torch Mobile’s team of highly skilled developers has been actively involved in Open Source development and includes contributors, Committers and Reviewers of the WebKit project. As part of RIM, these developers will continue to be active participants in the WebKit development community.
Please note that the Iris Browser is no longer available for download. Torch Mobile would like to thank our customers for their support.