I'm just wondering if there is an ideal size to use for a custom background image, so that it views ok in different size monitors, screen resolutions, etc.? I've been playing with it a bit, and I used the same size as my custom Twitter background image (http://twitter.com/themeridjournal), 1920 x 1200, which looks great on my monitor (iMac, 1680 x 1050). I'm keeping it fixed, with the blog text scrolling over it. I'm using the Twenty Ten theme, and I don't want to use tiling.
I also noticed though for example that when I view the blog, in normal mode, on my iPhone, the background is no longer fixed, and scrolls with the blog text. Is this just because of limits in the mobile Safari browser I'm using? So in the meantime, I've reverted to a plain black background.
The blog I need help with is themeridianijournal.com.