arxiv.org, Google papers
Google research papers (about 250 papers) are collected here:
http://labs.google.com/papers.html
Meanwhile arxiv.org is getting really large -- more than 430,000 texts in physics, mathematics, computer science, quantitative biology and statistics, including some full length books.
For example, the new classic monograph in the theory of N-categories and infinity-categories, Higher Topos Theory by Jacob Lurie, is there.
http://labs.google.com/papers.html
Meanwhile arxiv.org is getting really large -- more than 430,000 texts in physics, mathematics, computer science, quantitative biology and statistics, including some full length books.
For example, the new classic monograph in the theory of N-categories and infinity-categories, Higher Topos Theory by Jacob Lurie, is there.