persist vsx package settings in project configuration file

Question

I developped a Visual Studio 2008 package that adds some menu/commands to the IDE.

I have settings related to this package that I would like to save for each VS project where I use the package.

1. How do I get the current selected project (assuming I have either a solution with several projects) using DTE2 methods.

2. How do I programmaticaly read/modify custom settings in .*proj file (from each project).

Thanks.