The 1.5 billion dollar Physical Silver Trust appears to have sold out, at least whatever allotment that TD Waterhouse reserved for their clients. That took less than 24 hours.
Update: The following article says that the PSLV raised only 270 million. That is still an enormous amount of silver.
Sprott Physical Silver Trust Prices Follow-on Offering of Trust Units In An Aggregate Amount of US$269,575,000