Thanks everyone. I went ahead and tried what beenthere suggested:
1) set the fan to "On"
2) turn on furnace
3) turn up thermostat to 5º F above room temp.
So, here the timeline I get doing this:
11 secs: inducer fan kicks on
13 secs: ignitor starts sparking
20 secs: pilot lights
21 secs: burners light
Everything continues on from there, with the unit not kicking off.
The fan limit control starts its rotation, and continues doing so for about 3min, but it never kicks off.
Here's a video showing the above (the thermostat was turned on about 2 seconds in): http://www.youtube.com/watch?v=9PHmNJurA_w
techpappy: Is this consistant with the Fan Limit control failing?
Thanks again everyone!