Splenda has dextrose and maltodextrin as filler.
Equal/Nutrasweet (aspartame) and Sweet 'n' Low (saccharin) also contain the same products as fillers. Note that the amounts of these fillers do not even amount to one gram of carbohydrate per packet/serving, BUT these are the same glucose polymers that we use postworkout
for a quick insulin SURGE! (In doses 100 times what comes in one packet...)
Interesting tidbit (from Wikipedia):
Dan "Waiting for the research that says that Splenda gives babies AIDS" McVicker
Edited for clarity and extra detail.