About the memory issue. Someone said that Opera Mobile uses way too much RAM....
I made a test between Opera Mobile and the Nokia browser on my E61 and I noticed that the nokia one uses much more memory than opera.
Sure, when you look in Taskman, where it lists the amount of memory used per application, you'll see that Opera uses more memory, but the thing is, Taskman won't show the cache of ram used by the Nokia browser.
Here's how you can test the memory usage.
Load a big webpage like cnn.com on opera mobile, then go in taskman and look at your FREE ram.
Then load cnn.com with nokia browser and look at the FREE ram.
You'll notice you got a lot more free ram with Opera Mobile than the nokia browser.
I do prefer the nokia browser though, as it is embedded with the rest of the phone for loading streaming media and such, but Mobile Opera allows you to view web pages like the Nokia browser, AND to view webpages slimmed down so it is as wide as the phone's screeen. So you dont need to scroll left/right.
The Mobile Opera also allows to change the shortcut keys, it has a very useful homepage which doesnt require to connect to the internet before viewing it. You can scroll up or down quickly without using the joystick. And you can manage your downloads. The Nokia browser often started SHOWING me the download data (as if you opened the file with notepad) instead of storing it for running it. I couldnt download .sisx files because of that.
Ohh... and the nokia browser is in 2 parts, one for wap pages, the other for html pages. So you gotta switch everytime you change the type of webpages. Opera doesnt do that.
At least the nokia browser can view multiple pages and I love the "go back" function, but it's too "lite". Maybe if there were a hybrid of Nokia and Opera browsers, it would be perfect.
Until then, I use both browsers, depending of what I do.