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It's easy to do ticker tapes with the Tcl/Tk plugin:

Here's a ticker tape twice as fast as the above. In this one, I am also playing with event bindings on text. Notice how the cursor changes when you enter different messages, and how the foreground color changes:

And twice as fast again:

Source:

Here's the source for the first ticker tape, above:

set index 0
array set text_messages {
    0	"What a nice day! Get away from the computer!"
    1	"Sunny and cool at the ocean, breezy and cloudy"
    2	"A day for the beach, not work, eh?"
    3	"I tell yah, we're wasting away here. Time to go!"
}
proc ticker {t d f e} {
    global index text_messages

    scan [$t index 1.end] %d.%d line len
    if {$len < $e} {
	if {![info exists text_messages($index)]} {
	    set index 0
	}
	set message $text_messages($index)

	$t configure -state normal
	$t insert end "$f" fill
	$t insert end $message tag$index
	$t configure -state disabled

	incr index
    }
    $t configure -state normal
    $t delete 1.0 ; # delete first char
    $t configure -state disabled
    after $d [info level 0] ; # repeat this command after delay
}

font create normFont -family Times -size 12
font create boldFont -family Times -size 12 -weight bold

set t [text .t -wrap none -state disabled -font normFont \
	   -bd 1 -bg white -highlightthickness 0]
$t tag configure fill -foreground red
$t tag configure tag0 -font boldFont -foreground blue1
$t tag configure tag1 -foreground blue4
$t tag configure tag2 -foreground RoyalBlue4
$t tag configure tag3 -underline true -foreground SlateBlue3
pack $t

set tick 400
if {[info exists embed_args(tick)]} { set tick $embed_args(tick) }
ticker $t $tick " ******* " 95