LOL, cracklicious,
Under Skip's ruling it can still be worth it to get the flaming burst for some items. For instance the scythe at X4 damage on a crit would do X4 +3d10 damage. That's a lot of damage.
Skip might also be going under the stacking rules because the damage from flaming and flaming burst are both bonus fire damage.
I'm with the monte version of this one: "also" = "in addition to."
from the srd:
"A flaming burst weapon functions as a flaming weapon that also explodes with flame upon striking a successful critical hit. The fire does not harm the hands that hold the weapon. Flaming burst weapons deal +1d10 points of bonus fire damage on a successful critical hit. If the weapon’s critical multiplier is x3, add +2d10 points of bonus fire damage instead, and if the multiplier is x4, add +3d10 points of bonus fire damage. Bows, crossbows, and slings so enchanted bestow the fire energy upon their ammunition."
"Upon command, a flaming weapon is sheathed in fire. The fire does not harm the hands that hold the weapon. Flaming weapons deal +1d6 points of bonus fire damage on a successful hit. Bows, crossbows, and slings so enchanted bestow the fire energy upon their ammunition."