Got some answers for you guys:

1) Regarding the silver/silver salts - this is from Physicians Formula's R&D dept:

"There is less than 4 one thousandths of a gram of silver in our Organic Wear Foundation, and it is a natural preservative.  We are however, going to replace it with a plant derived preservative going forward, since there is some negative perception of colloidal silver. The Warning is only required in Canada - the FDA does not require anything similar in the US, so they apparently do not feel this is a concern."

2) Regarding the Physicians Formula CoverToxTen50™ Wrinkle Therapy Foundation:

Yes, it is discontinued. But there is a CoverTox powder that Physicians Formula's publicist tells me is similar:
http://www.physiciansformula.com/en-us/productdetail/02736.html

I hope that helps, ladies!