[wccrawford]

Actually, I see it at the end. Example:

I totally love what you did there.

/sarcasm

At the beginning, I'd definitely agree with you.

[pluies_public]

But then, you can't tell whether the sarcasm was intended from the very beginning of the message or merely the last sentence/paragraph.

[epochwolf]

I prefer this method in irc </sarcasm>