Identity Development Training Course (link).
For security in ASP.Net check the ASP.Net section.
OAuth (link).
Beginner's Guide to OAuth (link).
Compliance: What Architects Must Know (link).
Creating Audit Trail with SQL Server (link).
DotNetOpenAuth (link).
OpenID with .NET (link or Google Code).
Run your own identity server (link).
Example on how to implement OpenAuth with ASP.NET web site can be seen on TekPub starter site (link).
Setting up SSH server with Cygwin under Windows.
mkpasswd -l -u UserName >> /etc/passwd
for local users, or
mkpasswd -l -d -u UserName >> /etc/passwd
for domain users. Adjust the passwd file manually.