there seems also to be a correlation in the downturn with this news from UNI:
http://www.smh.com.au/news/Business/Unilife-signs-20m-deal-with-US-firm/2007/05/22/1179601392543.html
not sure if the european deal mentioned encroaches on an ITD market or potential market and therefore how reasonable the share price reaction was, and/or if it was insiders acting in the same timeframe