The dollar reached its worst level during the London session and spent the US session backing and filling ahead of tomorrows speech from Bernanke at a Boston Fed conference. Traders hope he will put some meat on the bones of the market’s hopes for quantitative ease.

EUR/USD pulled back to roughly test support at 1.4030 (1.4036 the low) after yields rose following the US 30-year bond auction. We bounced strongly there after and rallied into the 1.4080s after the Google news. Options-related selling (linked to an expiring 1.4100 digital) helped cap gains during the US morning while large 1.4125 offers are eyed on rallies from options players, traders report.

UISD/JPY enjoyed a modest rally during the US session, trading from an early low of 82.09 to a an intraday high of 81.68 after the bond auction. Resistance remains at 81.65/70 and again at 82.00. Real money was a steady buyer of USD/JPY again today, for a third straight session.

USD/CAD rebounded today from below parity on demand from Canadian corporates as well as a dovish report from a US think-tank. We squeezed as high as 1.0075 and end the day at 1.0050.

AUD/USD retrenched for much of the US session, drifting back to 0.9900 after failing to overcome 1.00 in London. Hedge funds were rumored profit-takers during the US morning. We end the session at 0.9935/40 as risk appetites improved on the late earnings reports.

Cable ends the day above 1.6000 after spending the US session in a tight-for-cable 1.5975/1.6020 range.

The US opens with a bang tomorrow. Bernanke speaks at 12:15 GMT and retail sales and CPI follow at 12:30…