Your average power strip can handle 13 amps or so...on a 120 volt circuit that's roughly 1500 watts you'd have to pull before having to worry too much. You'd have to add a lot more cfl's than splitters will ever get you before you will reach any point where danger is a concern.
If you use 4 per cord/plug, then you are still only pulling around the same amount of power as you would with a single 100w incandescent. That alone should tell you that your average lamp capable of supporting a 100w incandescent bulb can theoretically handle 4x23 watt cfls...as that is actually less wattage. Unless you have some incredibly cheap splitters that are prone to overheating under a pathetic load, then you will be fine.

said it better than i did.

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