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LEM has a similar idea, but requires special attention to the PCB since the current does not pass through the IC (as it does in the Allegro case)
**broken link removed**
Browse their web site, they may have something close to what you need.
Of course you can also simply sense across a resistor- it depends if you need isolation
You can use bolometry -- run the AC current through a resistive load, then measure the temperature. This is done in some older high-end RMS Voltmeters... Jim Williams has some literature on the topic. Search LTC's appnotes.
1. Hall-effect current sensors.
2. Resistive (voltage drop across ressitor) current sensors.
This application note discusses these 2 methods: **broken link removed**
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