[ultrobast]

Maybe I'm being dumb here, but what's the 'one space after a period' rule about? I put two in out of habit and have never thought it a problem.

It doesn't seem to make sense as far as mucking up layouts go either. The extra space is dropped in HTML for a start and if it wasn't, any site that can't handle a couple of extra spaces isn't going to fare much better with any other text entered.

[brudgers]

The two space rule was based on the monospacing used by typewriters.

With proportional text, one space typically creates better typography.