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There appears to be a proposition for angled text in CSS3 but still waiting for that final release then for the browsers to catch up to it in their support.
For not your best bet is to use graphics to create your angled text.
This is for long column headers
Did you by any chance mean 90 degrees? 45 degrees would be a diagonal, corner-to-corner thing, and as far as I know that can only be accomplished with some kind of proprietary filter. If you did mean 90 degrees, the future holds promise, at least, but for the present, browser support is restricted to IE.
To support international alphabets, glyphs and layouts, CSS-3 has a set of rules for "writing-mode". See [w3.org...]
This would allow you to use style="writing-mode:tb-rl". As I said above, IE supports this, but not Firefox, Opera or Safari. The writing-mode rules replace an older, deprecated set of CSS-2 rules called "layout-flow" which also had no browser support.
Last time I heard statistics Macs use is increasing and if you want anyone with an iPod or iPhone to see your page you'll be out of luck there also.
Actually, those guys are out of luck. The iPhone browser doesn't support javascript, so it's useless as a modern browser.
Until they fix that, I don't want those people as customers.