One thing I forgot earlier - which Alexis Glick reminded me of - the $20 billion from the November bailout (plus another $7 billion) will each convert into separate trust preferred securities with a coupon of 8% .
So even though there is massive dilution, there is still another $27 billion in preferred that the Govt owns, that could also be converted at a later date.
Assuming the same conversion price of $3.25, this would result in another 8.30 billion shares being issued, in addition to the existing:
16.15 + 5.45 = 21.60 billion shares.
This would result in the US Govt owning (25 + 20 + 7) 52 billion / 3.25 = 16 billion shares out of 29.9, or a 53% stake in the common stock.