What is your orientation (not THAT kind!) and why won't the phone screen rotate?
Personally, I prefer using my S2 in landscape. I get the use of both thumbs; its a more "traditional" screen dimension for video; on-screen keyboarding with the full keyboard is much easier; etc
Now, the question isn't so much because I am genuinely interested in your preference as much as it is a question as to why the PHONE screen doesn't rotate (bugs the HECK out of me) and why the landscape orientation seems to be overlooked in many of the themes and wallpaper controls.
I love my theme (Real Hero) but ALWAYS have the thing in landscape position (especially when it's in my home-made stand on my desk). I find myself putting it into portrait just so I can admire the theme.