wow these project are really nice.
i hope deeply PdLib would make it with or without soc. imo that is soooo missing in pd-extended. i'd love to help but i don't even know how to help to get the help-files in running in pd-ext. http://puredata.info/dev/summer-of-code/PdLib/
LibPd would be also a huge addition. http://puredata.info/dev/summer-of-code/LibPd/
only negative point i have is the name: PdLib and LibPd is kind of confusing.
but as already stated, all projects are great and would be wonderful.