I think, perhaps, that I see the two versions as similar in relationship to 'all ways' and 'always' - not meaning exactly the same as each other - as Ningloreth and the Cambridge Guide to English Usage seem to suggest as well.
'All right' suggests that all is right - 'alright' suggests that things are just about acceptable.
Also of course, you wouldn't say "All right," as an agreement to do something, I don't think - as in
"When you are out can you get a bottle of milk?" "Alright."
Or would you actually have to write
"When you are out can you get a bottle of milk?" "All right."?
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Date: 2011-07-30 06:27 pm (UTC)'All right' suggests that all is right - 'alright' suggests that things are just about acceptable.
Also of course, you wouldn't say "All right," as an agreement to do something, I don't think - as in
"When you are out can you get a bottle of milk?" "Alright."
Or would you actually have to write
"When you are out can you get a bottle of milk?" "All right."?
Which just looks silly. Well, to me, anyway.