Since I heard people praising Opera 9.01, I used it all the time since a week now.
I installed it on my notebook and 2 desktops I have at home. I have Firefox (since a year) on these systems as well. Honestly, Firefox is faster and better
with only taking up memory in my slower notebook.
Only good thing is Opera adjusts the google inbox very nicely for me
I dont know how... My GMail inbox looks better in Opera than in Firefox or IE. Check the snapshots on the links below:
http://www.savefile.com/files/2202667
http://www.savefile.com/files/4705485
A couple of websites were not working properly having web 2.0 stuff. Couple of sites I work on Opera couldnt support all the features: [i]Windows Live Mail, Yahoo Mail Beta, Flickr, Zooomr, & a few sites having Java applications??