*Aussie soars to new multi-month high of 0.781 against US dollar

*Geithner - Treasury still has $123.7 billion in TARP funds available

Asia Roundup: Japan's Economy Shrinks At Record Pace, Thailand Holds Key Rate

*Geithner - Public private investment program has potential to expand from $500 billion to $1 trillion

US dollar plunges to multi-month lows against euro, franc and pound