Neural Network FAQ - This FAQ from comp.ai.neural-nets contains the most commonly asked questions about neural networks, including some great introductory material.

Reinforcement Learning Repository - A centralized resource for researchers of reinforcement learning. Maintained at Michigan State University.

Boosting Research Site - Scientific homepage on boosting and ensemble learning methods.

neural101.com - Non-commercial site for information related to trading the financial markets using neural networks. Includes message bases, links and database of trading indicators, systems, and scans.

Connectionists - Moderated mailing list for discussion of technical issues and dissemination of information pertaining to neural computations. Membership is restricted to students and faculty members.

Maximum Entropy Online Resources - Workshops, tutorials, papers and software related to maximum entropy.

Gaussian Processes - A website keeping track of developments in Gaussian processes. Has links to online papers and their authors and software.

Sequential Monte Carlo Methods - Website dedicated to sequential data analysis and tracking using particle filters.

Neuroinformatics - A hub for the neuroinformatics community, with information on workshops and courses. Also hosts the comp-neuro mailing list.

David E. Rumelhart Prize - An annual award for contributions to the formal analysis of human cognition.

Bibliographies on Neural Networks - Part of the collection of computer science bibliographies.

Evaluation of Face Recognition Algorithms - An online resource for face recognition researchers that provides a standard set of well known algorithms and experimental protocols with which novel algorithms can be compared.

Principal Curves Page - Introduction to principal curves, with summary of and links to publications, demo, and software.

Kernel Machines - A central source of information on kernel based methods, including support vector machines, Gaussian processes.

CI Bibtex Collection - A collection of bibTex entries for neural network related articles and books.

Sumeet's neural networks listing - Includes related fields like genetic algorithms, fuzzy logic, adaptive computing and complex systems and descriptions of each site.