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and, FWIW, you can get formatted text by combining simple html markup with the textutil and pbcopy commands.

Code:
do shell script "echo " & quoted form of "<i>Hello</i> Mom!" & ¬
	" | textutil -format html -convert rtf -stdin -stdout | pbcopy -Prefer rtf"

tell application id "com.omnigroup.omnifocus"
	activate
	tell application id "com.apple.systemevents"
		keystroke "v" using {command down}
	end tell
end tell