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"A google of "opera vulnerability" gets about 400,000 results"
Opera got a lot in the it-news, because Opera getting a security issue was a big deal, in contradiction to IE and even Firefox(but less than IE) where it is common.
Now to call Opera(or any browser really) flawless is off course stupid, but Opera is by far if not the most, at least one of the most secure browsers out there.
Here is secunia's view of current new(not beta) browsers security situation. (Unpatched vulnerabilities), ranked from no known critical exploits to more critical exploits.
1. Opera 9.x (None): http://secunia.com/product/10615/
2. Firefox 2.x (Less critical): http://secunia.com/product/12434/
2. Safari 2.x (Less critical): http://secunia.com/product/5289/
3. Internet Explorer 7.x (Moderately critical): http://secunia.com/product/12366/