Is the static Web page or the Wiki maintained with relevant project information? Yes.
Is the project active? Yes.
Code and Documentation
Is the project SVN repository set up and maintained according to best practices? Yes.
If there stable versions and releases, does the project have the proper externals (releases point to releases, etc)? Yes.
Are there README/LICENSE/AUTHORS/INSTALL files? There is an AUTHORS file in the Ipopt directory, but not in the project root. There are also README, LICENSE, and INSTALL files.
Are the files in the proper location? Yes, in the project root there are INSTALL, LICENSE, and README files. In the Ipopt directory there are AUTHORS, LICENSE, INSTALL, and README files.
Does the INSTALL file give proper instructions for installation? Yes.
Does the code build properly on the platforms it claims to support (Level 2 and above)? I have tested Mac OS X, Linux, and Windows/MSYS and got successful builds.