User Agent String.Com 

User Agent String explained :

Opera 6.0
Opera	Name : Opera
6.0	Opera version
Macintosh	Platform
PPC Mac OS X	Operating System: OS X running on a PowerPC CPU (PPC)
U	Security values: N for no security U for strong security I for weak security
Last visit:	2007.03.13 01:57
All Opera user agent strings